Update dependency matplotlib to v3.8.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
matplotlib (source)	3.8.3 -> 3.8.4

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Release Notes

matplotlib/matplotlib (matplotlib)

v3.8.4: REL: v3.8.4

Compare Source

This is the fourth micro release of the 3.8 series.

Highlights of the 3.8.4 release include:

• Enable building against numpy 2.0; released wheels are built against numpy 2
• macosx: Clean up single-shot timers correctly
• Add a draw during show for macos backend
• Fix color sequence data for Set2 and Set3
• gtk: Ensure pending draws are done before GTK draw
• Update "Created with" url in hand.svg
• Avoid modifying user input to Axes.bar
• fix quiver3d incorrect arrow colors

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