feat: Adds support for java 21.

[damencho]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.24%. Comparing base (4f8dae4) to head (7f4bcdb).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1271      +/-   ##
============================================
- Coverage     26.42%   26.24%   -0.18%     
+ Complexity      474      467       -7     
============================================
  Files           126      126              
  Lines          7814     7814              
  Branches       1200     1200              
============================================
- Hits           2065     2051      -14     
- Misses         5440     5451      +11     
- Partials        309      312       +3     

see 2 files with indirect coverage changes

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