Switch codecov-action back to v3 as 4 significantly decreases coverage

[stefanceriu]

• previously seen in Codecov: Add token for codecov-action@v3 to fix coverage report #2727

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.

Generated by 🚫 Danger Swift against 8d8ddd4

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.03%. Comparing base (c2b9a7f) to head (8d8ddd4).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #3246       +/-   ##
============================================
+ Coverage    43.87%   71.03%   +27.16%     
============================================
  Files          723      729        +6     
  Lines        59406    64752     +5346     
============================================
+ Hits         26062    45999    +19937     
+ Misses       33344    18753    -14591     

Flag	Coverage Δ
unittests	68.78% <ø> (+32.44%)	⬆️

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