(chore) Update to codecov-action

[RustedBones]

Codecov coverage report changed to a github action.

See https://about.codecov.io/blog/january-product-update-updating-the-codecov-ci-uploaders-to-the-codecov-cli/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.22%. Comparing base (6ebf9c4) to head (b21e2f6).
Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5354      +/-   ##
==========================================
- Coverage   62.69%   61.22%   -1.48%     
==========================================
  Files         301      302       +1     
  Lines       10848    10846       -2     
  Branches      773      761      -12     
==========================================
- Hits         6801     6640     -161     
- Misses       4047     4206     +159     

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