Update matplotlib to 3.8.4

[pyup-bot]

This PR updates matplotlib from 3.8.2 to 3.8.4.

Changelog

3.8.4

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

3.8.3

This is the third micro release of the 3.8 series.

Highlights of the 3.8.3 release include:

- Improvements to the MacOS backend
- Fix hanging on `plt.pause`
- Fix warnings about "Secure coding is not enabled for restorable state"
- Fix crash at exit for PGF backend

Links

• PyPI: https://pypi.org/project/matplotlib
• Changelog: https://data.safetycli.com/changelogs/matplotlib/
• Homepage: https://matplotlib.org