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

[nhatthm]

Reverts #31

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7e67a26) 100.00% compared to head (6aca768) 100.00%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #33   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           90        90           
=========================================
  Hits            90        90           

Flag	Coverage Δ
features-Linux	71.11% <0.00%> (ø)
features-macOS	71.11% <0.00%> (ø)
unittests-Linux	52.22% <0.00%> (ø)
unittests-macOS	52.22% <0.00%> (ø)

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