workflows: Replace deprecated action 'codecov/test-results-action'

[VerifiedJoseph]

Replaces deprecated action codecov/test-results-action in tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2a33bd0) to head (67c7b50).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##                main     #1040   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       276       276           
===========================================
  Files             38        38           
  Lines            917       917           
===========================================
  Hits             917       917           

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