Unable to read Kubeconfig from secret file

### Jenkins and plugins versions report

Environment

```text
Jenkins: 2.361.1
OS: Linux - 5.4.0-1083-azure
---
ace-editor:1.1
analysis-model-api:10.17.0
ansible:1.1
ansicolor:1.0.2
ant:481.v7b_09e538fcca
antisamy-markup-formatter:2.7
apache-httpcomponents-client-4-api:4.5.13-138.v4e7d9a_7b_a_e61
artifactory:3.17.1
authentication-tokens:1.4
authorize-project:1.4.0
azure-ad:267.v5b_dfb_514d9fd
azure-cli:0.9
azure-credentials:242.vb_f9c4fa_6b_2b_6
azure-sdk:118.v43f74dd9ca_dc
basic-branch-build-strategies:1.3.2
blueocean:1.25.8
blueocean-autofavorite:1.2.5
blueocean-bitbucket-pipeline:1.25.8
blueocean-commons:1.25.8
blueocean-config:1.25.8
blueocean-core-js:1.25.8
blueocean-dashboard:1.25.8
blueocean-display-url:2.4.1
blueocean-events:1.25.8
blueocean-git-pipeline:1.25.8
blueocean-github-pipeline:1.25.8
blueocean-i18n:1.25.8
blueocean-jira:1.25.8
blueocean-jwt:1.25.8
blueocean-personalization:1.25.8
blueocean-pipeline-api-impl:1.25.8
blueocean-pipeline-editor:1.25.8
blueocean-pipeline-scm-api:1.25.8
blueocean-rest:1.25.8
blueocean-rest-impl:1.25.8
blueocean-web:1.25.8
bootstrap4-api:4.6.0-5
bootstrap5-api:5.2.1-3
bouncycastle-api:2.26
branch-api:2.1046.v0ca_37783ecc5
build-monitor-plugin:1.13+build.202205140447
build-user-vars-plugin:1.9
build-with-parameters:1.6
caffeine-api:2.9.3-65.v6a_47d0f4d1fe
checks-api:1.7.5
chromedriver:1.2
cloudbees-bitbucket-branch-source:791.vb_eea_a_476405b
cloudbees-credentials:3.3
cloudbees-folder:6.758.vfd75d09eea_a_1
command-launcher:90.v669d7ccb_7c31
commons-lang3-api:3.12.0-36.vd97de6465d5b_
commons-text-api:1.9-19.v8df45c678366
conditional-buildstep:1.4.2
config-file-provider:3.11.1
configuration-as-code:1512.vb_79d418d5fc8
copyartifact:1.47
credentials:1189.vf61b_a_5e2f62e
credentials-binding:523.vd859a_4b_122e6
data-tables-api:1.12.1-4
display-url-api:2.3.6
durable-task:500.v8927d9fd99d8
echarts-api:5.4.0-1
embeddable-build-status:255.va_d2370ee8fde
extended-read-permission:3.2
external-monitor-job:203.v683c09d993b_9
favorite:2.4.1
font-awesome-api:6.2.0-3
forensics-api:1.16.0
gatling:1.3.0
git:4.12.1
git-client:3.12.1
git-parameter:0.9.18
git-server:99.va_0826a_b_cdfa_d
github:1.35.0
github-api:1.303-400.v35c2d8258028
github-branch-source:1695.v88de84e9f6b_9
github-pullrequest:0.4.0
google-oauth-plugin:1.0.7
gradle:1.40
handlebars:3.0.8
handy-uri-templates-2-api:2.1.8-22.v77d5b_75e6953
htmlpublisher:1.31
http_request:1.16
instance-identity:116.vf8f487400980
ionicons-api:28.va_f3a_84439e5f
ivy:2.2
jackson2-api:2.13.3-285.vc03c0256d517
jacoco:3.3.2
jakarta-activation-api:2.0.1-2
jakarta-mail-api:2.0.1-2
javadoc:226.v71211feb_e7e9
javax-activation-api:1.2.0-5
javax-mail-api:1.6.2-8
jaxb:2.3.6-2
jdk-tool:55.v1b_32b_6ca_f9ca
jenkins-design-language:1.25.8
jersey2-api:2.37-1
jira:3.8
jjwt-api:0.11.5-77.v646c772fddb_0
jnr-posix-api:3.1.15-2
jquery:1.12.4-1
jquery-detached:1.2.1
jquery3-api:3.6.1-2
jsch:0.1.55.61.va_e9ee26616e7
junit:1150.v5c2848328b_60
kubernetes:3724.v0920c1e0ec69
kubernetes-client-api:5.12.2-193.v26a_6078f65a_9
kubernetes-credentials:0.9.0
liquibase-runner:1.4.10
locale:180.v207501dff9b_a_
lockable-resources:2.18
m2release:0.16.3
mailer:438.v02c7f0a_12fa_4
matrix-auth:3.1.5
matrix-project:785.v06b_7f47b_c631
maven-plugin:3.19
metrics:4.2.10-389.v93143621b_050
mina-sshd-api-common:2.9.1-44.v476733c11f82
mina-sshd-api-core:2.9.1-44.v476733c11f82
momentjs:1.1.1
netsparker-cloud-scan:2.1.5
oauth-credentials:0.5
okhttp-api:4.9.3-108.v0feda04578cf
pam-auth:1.10
parameter-separator:1.3
parameterized-scheduler:1.1
parameterized-trigger:2.45
pipeline-build-step:2.18
pipeline-github-lib:38.v445716ea_edda_
pipeline-graph-analysis:195.v5812d95a_a_2f9
pipeline-groovy-lib:612.v84da_9c54906d
pipeline-input-step:451.vf1a_a_4f405289
pipeline-milestone-step:101.vd572fef9d926
pipeline-model-api:2.2114.v2654ca_721309
pipeline-model-definition:2.2114.v2654ca_721309
pipeline-model-extensions:2.2114.v2654ca_721309
pipeline-multibranch-defaults:2.1
pipeline-rest-api:2.24
pipeline-stage-step:296.v5f6908f017a_5
pipeline-stage-tags-metadata:2.2114.v2654ca_721309
pipeline-stage-view:2.24
pipeline-utility-steps:2.13.0
plain-credentials:139.ved2b_9cf7587b
plugin-util-api:2.18.0
popper-api:1.16.1-3
popper2-api:2.11.6-2
prism-api:1.29.0-1
pubsub-light:1.17
resource-disposer:0.20
role-strategy:562.v44e9a_e828d0e
run-condition:1.5
saml:4.354.vdc8c005cda_34
scm-api:621.vda_a_b_055e58f7
script-security:1183.v774b_0b_0a_a_451
slack:625.va_eeb_b_168ffb_0
snakeyaml-api:1.32-86.ve3f030a_75631
sonar:2.14
sse-gateway:1.26
ssh-agent:295.v9ca_a_1c7cc3a_a_
ssh-credentials:305.v8f4381501156
ssh-slaves:2.846.v1b_70190624f5
sshd:3.249.v2dc2ea_416e33
structs:324.va_f5d6774f3a_d
timestamper:1.20
token-macro:308.v4f2b_ed62b_b_16
trilead-api:2.72.v2a_3236754f73
variant:59.vf075fe829ccb
violation-comments-to-github:1.96
warnings-ng:9.20.0
windows-azure-storage:380.va3a027b784f4
windows-slaves:1.8.1
workflow-aggregator:590.v6a_d052e5a_a_b_5
workflow-api:1192.v2d0deb_19d212
workflow-basic-steps:994.vd57e3ca_46d24
workflow-cps:2802.v5ea_628154b_c2
workflow-durable-task-step:1199.v02b_9244f8064
workflow-job:1239.v71b_b_a_124a_725
workflow-multibranch:716.vc692a_e52371b_
workflow-scm-step:400.v6b_89a_1317c9a_
workflow-step-api:639.v6eca_cd8c04a_a_
workflow-support:838.va_3a_087b_4055b
ws-cleanup:0.43
```

### What Operating System are you using (both controller, and any agents involved in the problem)?

Jenkins run on an AKS (Azure Kubernetes Service) cluster, configured with the [Jenkins Helm chart](https://github.com/jenkinsci/helm-charts/tree/main/charts/jenkins) (version 4.2.8), which itself uses the [Jenkins Docker image](https://hub.docker.com/r/jenkins/jenkins).

### Reproduction steps

1. store the kubeconfig file of an AWS EKS (Elastic Kubernetes Service) cluster in a Kubernetes secret in the same namespace where Jenkins is running (AKS cluster); this kubeconfig is intended to be used for the Kubernetes cloud configuration of Jenkins, as we want the Jenkins agents to run on the remote AWS EKS cluster
2. set up a secret file with JCasC, where the kubeconfig will be stored:
```
credentials:
system:
domainCredentials:
- credentials:

- file:
scope: GLOBAL
id: "remote-eks-cluster-kubeconfig"
fileName: "remote-eks-cluster-kubeconfig.yaml"
description: "Remote EKS cluster kubeconfig"
secretBytes:
```
3. set up the Kubernetes cloud with JCasC, using the previously created secret file:
```
jenkins:
clouds:
- kubernetes:
connectTimeout: 60
containerCap: 70
containerCapStr: "70"
credentialsId: "remote-eks-cluster-kubeconfig"
maxRequestsPerHost: 500
maxRequestsPerHostStr: "500"
name: "kubernetes-cloud-name"
namespace: "jenkins-remote-namespace"
readTimeout: 60
serverUrl: "https://XXXXXXXXXXXXXXXXXXXXXXXX.yyy.eu-west-1.eks.amazonaws.com"
templates:
...
```

### Expected Results

I expect that the Kubernetes cloud is configured and when I select it on Jenkins from myjenkins.com/manage/configureClouds/, I can click on `Kubernetes cloud details..` and then on `Test Connection` which gives me this message in return:
```
Connected to Kubernetes v1.22.13-eks-15b7512
```

### Actual Results

I manage to have the Kubernetes cloud configured; then I select it on Jenkins from myjenkins.com/manage/configureClouds/, I click on `Kubernetes cloud details..` and then on `Test Connection` but it gives me this error message in return:
```
Error testing connection https://XXXXXXXXXXXXXXXXXXXXXXXX.yyy.eu-west-1.eks.amazonaws.com: Failure executing: GET at: https://10.6.128.1/api/v1/namespaces/jenkins-remote-namespace/pods. Message: Forbidden!Configured service account doesn't have access. Service account may have been revoked. pods is forbidden: User "system:serviceaccount:jenkins-local-namespace:default" cannot list resource "pods" in API group "" in the namespace "jenkins-remote-namespace".
```
The `jenkins-remote-namespace` is the namespace of the EKS cluster where the Jenkins agents are supposed to run, while the `jenkins-local-namespace` is the namespace of the AKS cluster, where the Jenkins master runs and the Kubernetes secret with the kubeconfig is stored.

Additionally I have found this error in the Jenkins log:

```
Oct 05, 2022 4:24:28 PM SEVERE io.fabric8.kubernetes.client.Config loadFromKubeconfig
Failed to parse the kubeconfig.
unacceptable code point '' (0x13) special characters are not allowed
in "'reader'", position 29
at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:204)
at org.yaml.snakeyaml.reader.StreamReader.ensureEnoughData(StreamReader.java:169)
at org.yaml.snakeyaml.reader.StreamReader.ensureEnoughData(StreamReader.java:164)
at org.yaml.snakeyaml.reader.StreamReader.peek(StreamReader.java:119)
at org.yaml.snakeyaml.scanner.ScannerImpl.scanToNextToken(ScannerImpl.java:1222)
at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:338)
at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:256)
at org.yaml.snakeyaml.parser.ParserImpl$ParseImplicitDocumentStart.produce(ParserImpl.java:221)
at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:171)
at org.yaml.snakeyaml.parser.ParserImpl.getEvent(ParserImpl.java:181)
at com.fasterxml.jackson.dataformat.yaml.YAMLParser.nextToken(YAMLParser.java:403)
Caused: com.fasterxml.jackson.dataformat.yaml.JacksonYAMLParseException: special characters are not allowed
at [Source: (StringReader); line: 1, column: 1]
at com.fasterxml.jackson.dataformat.yaml.YAMLParser.nextToken(YAMLParser.java:409)
at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4761)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4667)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3629)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3597)
at io.fabric8.kubernetes.client.internal.KubeConfigUtils.parseConfigFromString(KubeConfigUtils.java:47)
at io.fabric8.kubernetes.client.Config.loadFromKubeconfig(Config.java:589)
at io.fabric8.kubernetes.client.Config.fromKubeconfig(Config.java:535)
at io.fabric8.kubernetes.client.Config.fromKubeconfig(Config.java:526)
at org.jenkinsci.plugins.kubernetes.auth.impl.KubernetesAuthKubeconfig.decorate(KubernetesAuthKubeconfig.java:29)
at org.csanchez.jenkins.plugins.kubernetes.KubernetesFactoryAdapter.createClient(KubernetesFactoryAdapter.java:104)
at org.csanchez.jenkins.plugins.kubernetes.KubernetesCloud$DescriptorImpl.doTestConnection(KubernetesCloud.java:742)
at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:710)
at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:397)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:409)
at org.kohsuke.stapler.interceptor.RequirePOST$Processor.invoke(RequirePOST.java:78)
at org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:207)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:140)
at org.kohsuke.stapler.MetaClass$11.doDispatch(MetaClass.java:558)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:762)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:894)
at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:289)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:762)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:894)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:830)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:894)
at org.kohsuke.stapler.MetaClass$9.dispatch(MetaClass.java:475)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:762)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:894)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:690)
at org.kohsuke.stapler.Stapler.service(Stapler.java:240)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:157)
at hudson.plugins.locale.LocaleFilter.doFilter(LocaleFilter.java:42)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at jenkins.security.ResourceDomainFilter.doFilter(ResourceDomainFilter.java:81)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at jenkins.telemetry.impl.UserLanguages$AcceptLanguageFilter.doFilter(UserLanguages.java:129)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at org.jenkinsci.plugins.ssegateway.Endpoint$SSEListenChannelFilter.doFilter(Endpoint.java:248)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at io.jenkins.blueocean.ResourceCacheControl.doFilter(ResourceCacheControl.java:134)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at io.jenkins.blueocean.auth.jwt.impl.JwtAuthenticationFilter.doFilter(JwtAuthenticationFilter.java:60)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at jenkins.metrics.impl.MetricsFilter.doFilter(MetricsFilter.java:125)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:154)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:160)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:154)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:94)
at jenkins.security.AcegiSecurityExceptionFilter.doFilter(AcegiSecurityExceptionFilter.java:52)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:54)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:122)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:116)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:109)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:106)
at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:97)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:223)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:217)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:97)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:112)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:82)
at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:63)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:111)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:172)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:53)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:86)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
at jenkins.security.SuspiciousRequestFilter.doFilter(SuspiciousRequestFilter.java:38)
at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:549)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1571)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1378)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1544)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1300)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
at org.eclipse.jetty.server.Server.handle(Server.java:562)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$0(HttpChannel.java:505)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:762)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:497)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:282)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:319)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:412)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:381)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:268)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.lambda$new$0(AdaptiveExecutionStrategy.java:138)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:407)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:894)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1038)
at java.base/java.lang.Thread.run(Thread.java:829)
```

### Anything else?

I have checked old issues to find similar problems, but the only one that I have found is this one: https://github.com/jenkinsci/configuration-as-code-plugin/issues/702

As you can see from my plugins report, I have a version of the `plain-credentials` greater than `1.5`.