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

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

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.95%. Comparing base (7fa19a2) to head (aefde1f).

Additional details and impacted files

```diff @@ 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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