Crossed references lead to a io.vertx.core.VertxException: Thread blocked

### Questions

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### Version

4.5.8

### Context

As described in #74 we work with more than one hundred of OpenAPI files. Most of them use relative references to components in other OpenAPI files. They are provided by a third party.

With the aim of going further, we have updated the relative references by fake absolute references in a given OpenAPI file (A).
It lead us to update some other OpenAPI files and one of them contained a reference to the first one OpenAPI file A.

The OpenAPIContract.from call looks like that (A is in the same time as unresolvedContractPath and in additionalContractFiles):

```
OpenAPIContract.from(
vertx
, "A.yaml"
, Map.of(
"https://www.example.com/B.yaml", "B.yaml"
, "https://www.example.com/C.yaml", "C.yaml"
, "https://www.example.com/D.yaml", "D.yaml"
, "https://www.example.com/A.yaml", "A.yaml"
)
).onSuccess(contract -> {
contract.operations().forEach(op -> LOGGER.info("operationId=", op.getOperationId()));
LOGGER.info("end of onSuccess");
}).onFailure(t -> LOGGER.error("onFailure t=", t));

```

When running the app, the following option is thrown:

> 2024-06-10 16:26:42,116 WARN [vertx-blocked-thread-checker] ?: Thread Thread[vert.x-worker-thread-3,5,io.vertx.core.Launcher] has been blocked for 60885 ms, time limit is 60000 ms
io.vertx.core.VertxException: Thread blocked
at java.base@17.0.5/java.util.regex.Pattern$Start.match(Pattern.java:3608)
at java.base@17.0.5/java.util.regex.Matcher.search(Matcher.java:1728)
at java.base@17.0.5/java.util.regex.Matcher.find(Matcher.java:745)
at java.base@17.0.5/java.util.regex.Matcher.replaceAll(Matcher.java:1177)
at java.base@17.0.5/java.lang.String.replaceAll(String.java:2942)
at io.vertx.json.schema.impl.Utils$Pointers.escape(Utils.java:303)
at io.vertx.json.schema.impl.JsonRef.parse(JsonRef.java:275)
at io.vertx.json.schema.impl.JsonRef.parse(JsonRef.java:275)
at io.vertx.json.schema.impl.JsonRef.parse(JsonRef.java:275)
at io.vertx.json.schema.impl.JsonRef.parse(JsonRef.java:275)
at io.vertx.json.schema.impl.JsonRef.parse(JsonRef.java:275)
at io.vertx.json.schema.impl.JsonRef.parse(JsonRef.java:275)
at io.vertx.json.schema.impl.JsonRef.resolve(JsonRef.java:133)
at io.vertx.json.schema.impl.JsonRef.resolveUri(JsonRef.java:341)
at io.vertx.json.schema.impl.JsonRef.resolve(JsonRef.java:211)
at io.vertx.json.schema.impl.JsonRef.resolveUri(JsonRef.java:341)
at io.vertx.json.schema.impl.JsonRef.resolve(JsonRef.java:211)
at io.vertx.json.schema.impl.JsonRef.resolveUri(JsonRef.java:341)
at io.vertx.json.schema.impl.JsonRef.resolve(JsonRef.java:211)
...
...
...
at io.vertx.json.schema.impl.JsonRef.resolveUri(JsonRef.java:341)
at io.vertx.json.schema.impl.JsonRef.resolve(JsonRef.java:211)
at io.vertx.json.schema.impl.JsonRef.resolveUri(JsonRef.java:341)
at io.vertx.json.schema.impl.JsonRef.resolve(JsonRef.java:211)
at io.vertx.json.schema.impl.JsonRef.resolveUri(JsonRef.java:341)
at io.vertx.json.schema.impl.JsonRef.resolve(JsonRef.java:211)
at io.vertx.json.schema.impl.SchemaRepositoryImpl.resolve(SchemaRepositoryImpl.java:243)
at io.vertx.openapi.contract.OpenAPIVersion.lambda$resolve$3(OpenAPIVersion.java:86)
at io.vertx.openapi.contract.OpenAPIVersion$$Lambda$499/0x00000008010f9708.handle(Unknown Source)
at io.vertx.core.impl.ContextImpl.lambda$executeBlocking$1(ContextImpl.java:191)
at io.vertx.core.impl.ContextImpl$$Lambda$471/0x000000080109fd08.handle(Unknown Source)
at io.vertx.core.impl.ContextInternal.dispatch(ContextInternal.java:279)
at io.vertx.core.impl.ContextImpl.lambda$internalExecuteBlocking$2(ContextImpl.java:210)
at io.vertx.core.impl.ContextImpl$$Lambda$472/0x00000008010a41f8.run(Unknown Source)
at io.vertx.core.impl.TaskQueue.run(TaskQueue.java:76)
at io.vertx.core.impl.TaskQueue$$Lambda$455/0x0000000801092a80.run(Unknown Source)
at java.base@17.0.5/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base@17.0.5/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base@17.0.5/java.lang.Thread.run(Thread.java:833)

### Do you have a reproducer?

A reproducer is a simple project hosted on GitHub (or another forge supporting git clone operation) that has a build file that can be executed to reproduce the issue.

Reproducers are very helpful for contributors and will likely help them fixing your bug faster.

* Link to github project/gist

### Steps to reproduce

1. ...
2. ...
3. ...
4. ...

### Extra

* Anything that can be relevant such as OS version, JVM version