Update matplotlib requirement from ~=3.5.0 to ~=3.5.1

[dependabot[bot]]

Updates the requirements on matplotlib to permit the latest version.

Release notes

Sourced from matplotlib's releases.

REL: v3.5.1

This is the first bugfix release of the 3.5.x series.

This release contains several critical bug-fixes:

• fix installation issues when setting a default backend
• fix add_lines on horizontal colorbars
• fix streamplot with start points on right or top edge
• fix colorbars with boundaries or NoNorm
• fix colorbars with negative contours
• fix colorbars with tight layout
• fix setting Axis label alignment to center
• fix subfigure tight bounding box
• fix subplot parameter window on macosx backend
• fix unit handling in Collections.set_offsets
• fix unyt integration in errorbar
• re-display date offset in ConciseDataFormatter after zoom
• reduce do_3d_projection deprecation warnings in external artists

Commits

• 710fce3 REL: v3.5.1
• 99469da Merge branch 'v3.5.0-doc' into v3.5.x
• 574c0da DOC: Update GitHub stats for 3.5.1
• 2d84c62 Merge pull request #21926 from QuLogic/auto-backport-of-pr-21913-on-v3.5.x
• 3b38f2f Merge pull request #21924 from meeseeksmachine/auto-backport-of-pr-21861-on-v...
• 6d14827 Backport PR #21913: Make colorbar boundaries work again
• 68e9b15 Small cleanups to colorbar.
• f039a02 Merge pull request #21923 from meeseeksmachine/auto-backport-of-pr-21753-on-v...
• a7e05bd Merge pull request #21922 from meeseeksmachine/auto-backport-of-pr-21753-on-v...
• 6833288 Backport PR #21861: DOC: Small formatting improvement to set_markevery
• Additional commits viewable in compare view

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