compat: Matplotlib 3.11.0

[hoxbro]

Description

Compatibility with Matplotlib 3.11.0.

Still getting a UserWarning for RadialHeatMap tests, open an issue here: matplotlib/matplotlib#31574.

How Has This Been Tested?

Locally

Checklist

• Pull request title follows the conventional format
• Tests added and is passing

[codecov]

Codecov Report

❌ Patch coverage is 68.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.21%. Comparing base (948ee3c) to head (f2c108c).

Files with missing lines	Patch %	Lines
holoviews/plotting/mpl/element.py	62.50%	6 Missing ⚠️
holoviews/plotting/mpl/plot.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6856      +/-   ##
==========================================
- Coverage   89.22%   89.21%   -0.01%     
==========================================
  Files         340      340              
  Lines       73969    73982      +13     
==========================================
+ Hits        65999    66004       +5     
- Misses       7970     7978       +8     

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