update github CI workflows

[OriolAbril]

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📚 Documentation preview 📚: https://xarray-einstats--83.org.readthedocs.build/en/83/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.52%. Comparing base (2cb94c8) to head (96f0d4b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #83   +/-   ##
=======================================
  Coverage   91.52%   91.52%           
=======================================
  Files           6        6           
  Lines         850      850           
=======================================
  Hits          778      778           
  Misses         72       72           

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