Update dependency matplotlib to v3.8.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
matplotlib (source)	==3.8.0 -> ==3.8.1

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Release Notes

matplotlib/matplotlib (matplotlib)

v3.8.1: REL: v3.8.1

Compare Source

This is the first bugfix release of the 3.8.x series.

This release contains several bug fixes and adjustments:

• Bump setuptools required version because of setuptools_scm v8
• Update find_nearest_contour and revert contour deprecations
• allsegs and allkinds return individual segments
• Restore default behavior of hexbin mincnt with C provided
• Try/except import of Axes3D
• Ensure valid path mangling for ContourLabeler
• BLD: Remove development dependencies from sdists
• FIX 2-tuple of colors in to_rgba_array
• Fix issue with non-string labels and legend
• Fix issue with locale comma when not using math text
• Various type hinting improvements
• Various documentation improvements
• Improvements to the MacOS backend

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