Update gallery environment

[philippjfr]

Dependency updates and removes the now unnecessary --global-loading-spinner (since panel-material-ui enables this by default).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.14%. Comparing base (99f03fc) to head (9d689f2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8601      +/-   ##
==========================================
- Coverage   85.76%   85.14%   -0.62%     
==========================================
  Files         350      350              
  Lines       56834    56834              
==========================================
- Hits        48743    48394     -349     
- Misses       8091     8440     +349     

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