Attempt to fix codecov

[IgorSusmelj]

Changes

• Fixed codecov by
  • properly cleaning codecov files before a new test
  • freezing the version
  • switch upload action to v4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.96%. Comparing base (209a4e8) to head (0e02889).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1542      +/-   ##
==========================================
+ Coverage   81.94%   81.96%   +0.02%     
==========================================
  Files         144      144              
  Lines        6075     6094      +19     
==========================================
+ Hits         4978     4995      +17     
- Misses       1097     1099       +2     

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