Update codecov action to v4

[petertrr]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.85%. Comparing base (b370f69) to head (5e08e59).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #109      +/-   ##
============================================
+ Coverage     85.30%   85.85%   +0.55%     
  Complexity      110      110              
============================================
  Files            14       14              
  Lines           524      502      -22     
  Branches         89       89              
============================================
- Hits            447      431      -16     
+ Misses           53       47       -6     
  Partials         24       24              

Flag	Coverage Δ
unittests	85.85% <ø> (+0.55%)	⬆️

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