Test on Java 17/21

[basil]

As in the archetype.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.49%. Comparing base (358ef35) to head (e5f4ce1).
Report is 55 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##               main     #338       +/-   ##
=============================================
+ Coverage     30.00%   40.49%   +10.49%     
- Complexity       64       97       +33     
=============================================
  Files            20       21        +1     
  Lines           460      526       +66     
  Branches         41       44        +3     
=============================================
+ Hits            138      213       +75     
+ Misses          319      309       -10     
- Partials          3        4        +1     

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