ci: remove unnecessary branches filter

[FrenchGithubUser]

github runs actions on all branches by default, no need to specify branches: ["*"]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.08%. Comparing base (43dbfd1) to head (c63d55b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #77   +/-   ##
=======================================
  Coverage   83.08%   83.08%           
=======================================
  Files          18       18           
  Lines        1874     1874           
  Branches      193      193           
=======================================
  Hits         1557     1557           
  Misses        234      234           
  Partials       83       83           

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