[release] unexpected return code for "Deploy to Maven Central" step

On buildkite, we get the following error message: `Error: The command exited with status 1`, however the artifacts are properly published by the release process in the `Deploy to Maven Central (Buildkite)` step.

There was at least two occurences of this in the recent releases:
- https://github.com/elastic/apm-agent-java/actions/runs/6312935059/job/17140161815
- https://github.com/elastic/apm-agent-java/actions/runs/5830491003/job/15812079572

In the buildkite logs, we can see the following error:
```
[ERROR] Failed to execute goal org.sonatype.plugins:nexus-staging-maven-plugin:1.6.13:deploy (injected-nexus-deploy) on project apm-opentracing: Remote staging failed: A message body reader for Java class com.sonatype.nexus.staging.api.dto.StagingProfileRepositoryDTO, and Java type class com.sonatype.nexus.staging.api.dto.StagingProfileRepositoryDTO, and MIME media type text/html was not found
```

We are already using the latest version of this plugin `1.6.13`, which is about a year old as I am writing this.
https://search.maven.org/artifact/org.sonatype.plugins/nexus-staging-maven-plugin

When this error happens, we can have two possible results (both cases already happened)
- the release artifact will still be published despite the error, the release workflow will successfully execute.
- the release artifact won't be published, the release workflow will fail as the artifact is not published and timeout is reached.

「Deploy to Maven Central (Buildkite)」リリースステップとリンクされた workflow の実行から始め、Buildkite のエラーをアーティファクトが公開されたかどうかと照合します。nexus-staging-maven-plugin がこのレスポンスをどのように報告するかを確認し、両方の結果を検証します。公開に成功した場合は成功した workflow にならなければならず、公開されなかったアーティファクトは一貫性のないステータスにならずに失敗しなければなりません。

索引モデルが issue の本文から書いたものです。