Update matplotlib requirement from >=3.9.4 to >=3.11.1

[dependabot]

Updates the requirements on matplotlib to permit the latest version.

Release notes

Sourced from matplotlib's releases.

REL: v3.11.1

This is the first bugfix release of the 3.11.x series.

This release contains several bug-fixes and adjustments:

• Fix tight layout of multiple subplots with sharey=True
• Fix NoNorm cursor formatting for uint8 images
• Fix occasional misalignment in reported mouse position (also fix a bug with canvas height)
• Fix clipped Axis labels on 3D plots with tight layout
• Fix inverted Axis on 3D plots
• Fix restoring 'auto' aspect in 3D axes after switching from 'equal'
• Fix missing glyphs when subsetting Type 1 fonts in PDF
• Fix oversized embedding of Type 42 fonts in PDF/PostScript files

As well as several documentation and typing improvements and corrections.

Commits

• 3c1757a REL: v3.11.1
• 792c6b5 DOC: Prepare for 3.11.1
• aaff9f6 Merge branch 'v3.11.0-doc' into v3.11.x
• d4f4527 Merge pull request #32052 from meeseeksmachine/auto-backport-of-pr-32038-on-v...
• 6ad4bcf Merge pull request #32050 from meeseeksmachine/auto-backport-of-pr-31304-on-v...
• 7fb74d3 Merge pull request #32051 from meeseeksmachine/auto-backport-of-pr-32037-on-v...
• c624aec Backport PR #32038: Fix occasional misalignment in reported mouse position (a...
• 8eda2b7 Backport PR #32037: Bump the actions group with 3 updates
• a0e7ae5 Backport PR #31304: Fix restoring 'auto' aspect in 3D axes after switching fr...
• 9001323 Merge pull request #32047 from meeseeksmachine/auto-backport-of-pr-32025-on-v...
• Additional commits viewable in compare view

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[TFD-42]

Closing: this floor bump requires Python >= 3.10/3.11, but the project supports Python 3.9+ (see README and the CI matrix — the 3.9 job fails with 'No matching distribution'). The >= bounds in requirements.txt document the minimum tested versions, not target versions. Dependabot is being switched to security-updates-only for pip to stop these proposals; this can be revisited if Python 3.9 support is ever dropped.

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