fix ci errors

[OriolAbril]

Description

There are some CI errors due to the new pylint version and the pandas 3.0 + numpy 2.1 nightlies.

Checklist

• Follows official PR format
• Includes new or updated tests to cover the new feature
• Code style correct (follows pylint and black guidelines)
• Changes are listed in changelog

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📚 Documentation preview 📚: https://arviz--2351.org.readthedocs.build/en/2351/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.95%. Comparing base (7fa19a2) to head (aefde1f).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2351      +/-   ##
==========================================
+ Coverage   80.45%   86.95%   +6.50%     
==========================================
  Files         123      123              
  Lines       12722    12722              
==========================================
+ Hits        10235    11063     +828     
+ Misses       2487     1659     -828     

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