Update codecov workflow and actions

[awvwgk]

• move config to .codecov.yml
• update all actions versions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.21%. Comparing base (3a50cbd) to head (43b47f6).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
- Coverage   48.63%   45.21%   -3.43%     
==========================================
  Files          34       25       -9     
  Lines        3707     2665    -1042     
  Branches     1518     1081     -437     
==========================================
- Hits         1803     1205     -598     
+ Misses       1207     1119      -88     
+ Partials      697      341     -356     

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