compat: Matplotlib 3.10.0

[hoxbro]

I just tested Matplotlib 3.10.0rc1 locally and saw it emitted the following warning: vert: bool was deprecated in Matplotlib 3.10 and will be removed in 3.12. Use orientation: {'vertical', 'horizontal'} instead.

This does the suggested change and also forces the box inside of the violin plot to follow invert_axes

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 88.51%. Comparing base (c0bbdd7) to head (95cffbd).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
holoviews/plotting/mpl/stats.py	70.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6431      +/-   ##
==========================================
- Coverage   88.51%   88.51%   -0.01%     
==========================================
  Files         323      323              
  Lines       68597    68610      +13     
==========================================
+ Hits        60722    60728       +6     
- Misses       7875     7882       +7     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.