Test on JDK 21

[AlbumenJ]

What is the purpose of the change

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

71.4% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #13083 (deb53d7) into 3.2 (139a62e) will decrease coverage by 0.41%.
Report is 11 commits behind head on 3.2.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.2   #13083      +/-   ##
============================================
- Coverage     69.78%   69.37%   -0.41%     
+ Complexity      341        2     -339     
============================================
  Files          3525     1649    -1876     
  Lines        167937    68576   -99361     
  Branches      28061    10002   -18059     
============================================
- Hits         117189    47578   -69611     
+ Misses        40622    16403   -24219     
+ Partials      10126     4595    -5531     

see 1908 files with indirect coverage changes

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