Bump matplotlib from 3.7.2 to 3.8.1 in /requirements

[dependabot]

Bumps matplotlib from 3.7.2 to 3.8.1.

Release notes

Sourced from matplotlib's releases.

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
• Various type hinting improvements
• Various documentation improvements
• Improvements to the MacOS backend

REL: v3.8.0

Highlights of this release include:

• Type hints for most public APIs
• Many improvements to Mathtext
  • Addition of \boldsymbol command
  • Additional sizable delimiters
  • Documentation improvements
  • \substack command
  • \middle delimitier
  • \mathbfit for bold italic text
• 3D plotting improvements
  • Specify tick/axis label positions
  • Improved text for coordinates in interactive sessions
  • Ability to share view angles
• New plotting method ecdf (empirical cumulative distribution function)

v3.8.0rc1

First release candidate for Matplotlib v3.8.0

REL: v3.7.3

This is the third bugfix release of the 3.7.x series.

This release contains several bug-fixes and adjustments:

• Add Python 3.12 wheels
• Update the license for the bundled colorbrewer colormap data
• Fix Cairo backend when using cairocffi

... (truncated)

Commits

• fac632f REL: v3.8.1
• 8c517cd Release prep v3.8.1
• 8c6b3e9 Merge remote-tracking branch 'origin/v3.8.0-doc' into v3.8.x
• 043a191 Merge pull request #27240 from meeseeksmachine/auto-backport-of-pr-27237-on-v...
• 08876f8 Merge pull request #27239 from meeseeksmachine/auto-backport-of-pr-27237-on-v...
• dc37d96 Merge pull request #27238 from meeseeksmachine/auto-backport-of-pr-27165-on-v...
• be5b1f5 Backport PR #27237: DOC: Add command to install appropriate `requirements.txt...
• 58a7f9a Backport PR #27237: DOC: Add command to install appropriate `requirements.txt...
• 0a77591 Backport PR #27165: Fixing Matplotlib Notebook Text
• 2e68a4e Merge pull request #27229 from ksunden/auto-backport-of-pr-27226-on-v3.8.x
• Additional commits viewable in compare view

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