Bump Elasticsearch/OpenSearch version used for tests/devservices to 8.15/2.16

[marko-bekhta]

this is an updated version of Yoann's PR #41507 (can't rebase it 😕) where the versions are bumped to 2.16 and 8.15

There's also a migration note in the original PR.

[quarkus-bot]

/cc @gsmet (elasticsearch,hibernate-search), @loicmathieu (elasticsearch)

[quarkus-bot]

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[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit aabab6d.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

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[github-actions]

🙈 The PR is closed and the preview is expired.

[yrodiere]

I added something to migration notes: https://github.com/quarkusio/quarkus/wiki/Migration-Guide-3.14#dev-services