Update codecov action to v4

[kddejong]

Issue #, if available:

Description of changes:

• Update codecov action to v4

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.62%. Comparing base (26a64dc) to head (47e82ac).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3675      +/-   ##
==========================================
- Coverage   93.63%   93.62%   -0.01%     
==========================================
  Files         358      358              
  Lines       12206    12206              
  Branches     2616     2616              
==========================================
- Hits        11429    11428       -1     
  Misses        431      431              
- Partials      346      347       +1     

Flag	Coverage Δ
unittests	93.56% <ø> (-0.01%)	⬇️

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