update sponsor and patrner logos

[OriolAbril]

Description

Follow up to arviz-devs/arviz-project#59

Checklist

• Follows official PR format
• Includes a sample plot to visually illustrate the changes (only for plot-related functions)
• New features are properly documented (with an example if appropriate)?
• 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--2490.org.readthedocs.build/en/2490/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.83%. Comparing base (2ead9f0) to head (9e9059b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2490   +/-   ##
=======================================
  Coverage   86.83%   86.83%           
=======================================
  Files         124      124           
  Lines       13029    13029           
=======================================
  Hits        11314    11314           
  Misses       1715     1715           

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