Actually raise a PR when java-bump is detected

[donoghuc]

This commit adds an action such that a PR is raised when updatecli detects a new java version.

[github-actions]

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Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label. Could you fix it @donoghuc? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• If no backport is necessary, please add the backport-skip label

[donoghuc]

Example run https://github.com/elastic/logstash/actions/runs/18788376330 produced #18352

[mashhurs]

LGTM!

[elasticmachine]

💛 Build succeeded, but was flaky

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• Commit: 37e6623

Failed CI Steps

• 🥼 IT Persistent Queues / part 2-of-6