chore(deps): update dependency matplotlib to v3.9.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
matplotlib	==3.9.2 -> ==3.9.4

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Release Notes

matplotlib/matplotlib (matplotlib)

v3.9.4: REL: 3.9.4

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This is the fourth bugfix release of the 3.9.x series.

This release contains two bug-fixes:

• Fix toolbar icons in GTK backend
• Fix Poly3DCollection initialization with list of lists

v3.9.3: REL: 3.9.3

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This is the third bugfix release of the 3.9.x series.

This release contains several bug-fixes and adjustments:

• Fix axline with extremely small slopes
• Fix axline with non-linear axis scales
• Fix minimumSizeHint with Qt backend
• Fix config directory usage when it's behind a symlink
• Fix draggable legend when blitting is enabled
• Fix high CPU utilization in the macosx backend
• Fix multiple hatch edgecolors passed to contourf
• Improve compatibility with pytest 8.2.0

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