pylint 4.x related fixes

[OriolAbril]

this should fix current CI failure

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📚 Documentation preview 📚: https://arviz--2489.org.readthedocs.build/en/2489/

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.83%. Comparing base (fae2e4d) to head (e292d0f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
arviz/rcparams.py	50.00%	1 Missing ⚠️
arviz/stats/stats.py	50.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (50.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2489   +/-   ##
=======================================
  Coverage   86.83%   86.83%           
=======================================
  Files         124      124           
  Lines       13018    13018           
=======================================
  Hits        11304    11304           
  Misses       1714     1714           

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