Revert "Bump codecov/codecov-action from 3 to 4"

[nhatthm]

Reverts #60

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c31cc9d) 89.04% compared to head (1a2443d) 89.04%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #68   +/-   ##
=======================================
  Coverage   89.04%   89.04%           
=======================================
  Files          10       10           
  Lines         292      292           
=======================================
  Hits          260      260           
  Misses         32       32           

Flag	Coverage Δ
unittests-Linux	89.04% <0.00%> (ø)

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