Address multiple deprecation warnings

[OriolAbril]

Description

Update black version (a lot of changes, mostly adding spaces between module docstrings and imports though) And address several deprecation warnings from multiple dependencies.

Checklist

• [x] Follows official PR format
• [ ] 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--2333.org.readthedocs.build/en/2333/

[codecov[bot]]

Codecov Report

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

Project coverage is 86.84%. Comparing base (7c52d0a) to head (07a819b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2333 +/- ## ========================================== + Coverage 86.80% 86.84% +0.03% ========================================== Files 123 123 Lines 12744 12744 ========================================== + Hits 11062 11067 +5 + Misses 1682 1677 -5 ```

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