Update bundled JDK to 21

[andsel]

Release notes

What does this PR do?

Updated bundled JDK to 21. Seems all plugins are fine: https://buildkite.com/elastic/logstash-supported-plugins-test-pipeline/builds/51.

Why is it important/What is the impact to the user?

Checklist

• [ ] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files (and/or docker env variables)
• [ ] I have added tests that prove my fix is effective or that my feature works

Author's Checklist

• [ ]

How to test this PR locally

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[elastic-sonarqube[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[elastic-sonarqube[bot]]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[elasticmachine]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: 613382d1b03e290909d10b0a59a14e2d1f9753ef

History

• :green_heart: Build #1001 succeeded d2a5843003e2a0c4c4f2f09e9918359e0f52d617

cc @andsel