Update matplotlib requirement from ~=3.3.1 to ~=3.4.1

[dependabot-preview[bot]]

Updates the requirements on matplotlib to permit the latest version.

Release notes

Sourced from matplotlib's releases.

REL: v3.4.1

This is the first bugfix release of the 3.4.x series.

This release contains several critical bug-fixes:

• fix errorbar when specifying fillstyle
• fix Inkscape cleanup at exit on Windows for tests
• fix legends of colour-mapped scatter plots
• fix positioning of annotation fancy arrows
• fix size and color rendering for 3D scatter plots
• fix suptitle manual positioning when using constrained layout
• respect antialiasing settings in cairo backends as well

Commits

• 223c30a REL: v3.4.1
• cc45fb9 DOC: Update GitHub stats for 3.4.1.
• 1748e33 Merge branch 'v3.4.0-doc' into v3.4.x
• 17b3aa0 Merge pull request #19834 from QuLogic/backport-19812
• 92a59fd Merge pull request #19833 from meeseeksmachine/auto-backport-of-pr-19811-on-v...
• 040649d Backport PR #19812: FIX: size and color rendering for Path3DCollection
• 6e6fcf4 Backport PR #19811: Fix Inkscape cleanup at exit on Windows.
• 6547ba2 Merge pull request #19816 from QuLogic/fix-scatter-legend
• 3bfe69c Merge pull request #19830 from meeseeksmachine/auto-backport-of-pr-19824-on-v...
• ebc9277 Merge pull request #19829 from meeseeksmachine/auto-backport-of-pr-19822-on-v...
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #121.