Update codecov action version

[eytanadler]

Purpose

Codecov push in GitHub Actions fails sometimes, so hopefully updating the action version will help.

Type of change

What types of change is it?
Select the appropriate type(s) that describe this PR

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Other (please describe)

Testing

Explain the steps needed to test the new code to verify that it does indeed address the issue and produce the expected behavior.

Checklist

Put an x in the boxes that apply.

• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Merging #52 (52d9797) into main (48d544d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   79.99%   79.99%           
=======================================
  Files          85       85           
  Lines        9297     9297           
=======================================
  Hits         7437     7437           
  Misses       1860     1860           

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