Fix coverage upload in CI test jobs

[make-github-pseudonymous-again]

See:

• Upcoming breaking change: Hidden Files will be excluded by default actions/upload-artifact#602
• [bug] Explicitly listed path that starts with a dot is ignored. actions/upload-artifact#618
• [bug] Explicitly requested hidden files should be uploaded without allowing all hidden files actions/upload-artifact#614

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.28%. Comparing base (71bed08) to head (5523058).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1079   +/-   ##
=======================================
  Coverage   66.28%   66.28%           
=======================================
  Files         719      719           
  Lines       10006    10006           
  Branches     1349     1349           
=======================================
  Hits         6632     6632           
  Misses       2915     2915           
  Partials      459      459           

Flag	Coverage Δ
client	45.86% <ø> (+<0.01%)	⬆️
server	62.60% <ø> (-0.02%)	⬇️
test	72.55% <ø> (ø)
test-app	53.73% <ø> (+0.01%)	⬆️

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