Update Java versions used for testing

[dotasek]

This will switch the Java version we use for pipeline testing to 17 from 11, and also add support for testing Java 21 LTS for execution and for utlities tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 12.86%. Comparing base (ff909b0) to head (3e484d1).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2087      +/-   ##
============================================
- Coverage     12.86%   12.86%   -0.01%     
+ Complexity    35670    35667       -3     
============================================
  Files          2445     2445              
  Lines        726279   726279              
  Branches     211348   211348              
============================================
- Hits          93440    93434       -6     
- Misses       600812   600818       +6     
  Partials      32027    32027              

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