Bump matplotlib from 3.7.2 to 3.8.4 in /requirements

[dependabot[bot]]

Bumps matplotlib from 3.7.2 to 3.8.4.

Release notes

Sourced from matplotlib's releases.

REL: v3.8.4

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

REL: v3.8.3

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

REL: v3.8.2

This is the second bugfix release of the 3.8 series.

Highlights of this release include:

• Fix a segfault in the MacOS backend when running on Python 3.12
• Fix Contour labeling manual positions selecting incorrect contours.
• Various documentation improvements

REL: v3.8.1

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

... (truncated)

Commits

• 8fb842c REL: v3.8.4
• 149521e Release prep v3.8.4
• 39e91a4 Merge branch 'v3.8.3-doc' into v3.8.x
• e5dd407 Github stats for v3.8.4
• dbb4e04 Merge pull request #28015 from meeseeksmachine/auto-backport-of-pr-27955-on-v...
• e0a38c6 Merge pull request #27993 from ksunden/np_2_build
• dea6de9 Backport PR #27955: Add a draw during show for macos backend
• 0ec1774 Unpin numpy 2 for install, build against numpy rc for isolated builds
• 8f1698f Merge pull request #28001 from meeseeksmachine/auto-backport-of-pr-28000-on-v...
• 79ee5af Backport PR #28000: Fix color sequence data for Set2 and Set3
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.49%. Comparing base (cc475ae) to head (6cb38fc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #272 +/- ## ======================================= Coverage 97.49% 97.49% ======================================= Files 5 5 Lines 719 719 ======================================= Hits 701 701 Misses 18 18 ```

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[dependabot[bot]]

Superseded by #279.