Bump matplotlib from 3.8.4 to 3.9.0 in /requirements

[dependabot[bot]]

Bumps matplotlib from 3.8.4 to 3.9.0.

Release notes

Sourced from matplotlib's releases.

REL: 3.9.0

Highlights of this release include:

• Plotting and Annotation improvements
  • Axes.inset_axes is no longer experimental
  • Legend support for Boxplot
  • Percent sign in pie labels auto-escaped with usetex=True
  • hatch parameter for stackplot
  • Add option to plot only one half of violin plot
  • axhline and axhspan on polar axes
  • Subplot titles can now be automatically aligned
  • axisartist can now be used together with standard Formatters
  • Toggle minorticks on Axis
  • StrMethodFormatter now respects axes.unicode_minus
• Figure, Axes, and Legend Layout
  • Subfigures now have controllable zorders
  • Getters for xmargin, ymargin and zmargin
• Mathtext improvements
  • mathtext documentation improvements
  • mathtext spacing corrections
• Widget Improvements
  • Check and Radio Button widgets support clearing
• 3D plotting improvements
  • Setting 3D axis limits now set the limits exactly
• Other improvements
  • New BackendRegistry for plotting backends
  • Add widths, heights and angles setter to EllipseCollection
  • image.interpolation_stage rcParam
  • Arrow patch position is now modifiable
  • NonUniformImage now has mouseover support

REL: v3.9.0rc2

This is the second release candidate for the meso release 3.9.0.

Commits

• be56634 REL: v3.9.0
• 846ce8a DOC: Finish documentation for 3.9.0
• 8604f67 Merge pull request #28206 from meeseeksmachine/auto-backport-of-pr-28205-on-v...
• 196c8db TST: Followup corrections to #28205
• d8f3016 Backport PR #28205: TST: Fix tests with older versions of ipython
• 4db5ac9 Merge pull request #28203 from QuLogic/auto-backport-of-pr-28164-on-v3.9.x
• ef1a2db Merge pull request #28204 from meeseeksmachine/auto-backport-of-pr-28195-on-v...
• e4384b8 Merge pull request #28191 from QuLogic/no-dev-theme
• 3b65546 Backport PR #28195: TST: Prepare for pytest 9
• 1b526c3 Backport PR #28164: CI: Ensure code coverage is always uploaded
• Additional commits viewable in compare view

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