Added Codecov token

[bodiam]

No description provided.

[bodiam]

Thanks @kingthorin for approving, it seems to not work yet however, despite the green builds. (code coverage report isn't uploaded yet from the ubuntu-latest/Java 17 plan)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.76%. Comparing base (b37c566) to head (de1a3d4).
Report is 220 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1304      +/-   ##
============================================
- Coverage     92.35%   91.76%   -0.59%     
- Complexity     2821     3080     +259     
============================================
  Files           292      310      +18     
  Lines          5609     6038     +429     
  Branches        599      628      +29     
============================================
+ Hits           5180     5541     +361     
- Misses          275      338      +63     
- Partials        154      159       +5     

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[bodiam]

Things seem to work again!