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

This release contains several bug-fixes and adjustments:

• Add GitHub artifact attestations for sdist and wheels
• Re-add matplotlib.cm.get_cmap; note this function will still be removed at a later date
• Allow duplicate backend entry points
• Fix Axes autoscaling of thin bars at large locations
• Fix Axes autoscaling with axhspan / axvspan
• Fix Axes3D autoscaling of Line3DCollection / Poly3DCollection
• Fix Axes3D mouse interactivity with non-default roll angle
• Fix box aspect ratios in Axes3D with alternate vertical axis
• Fix case handling of backends specified as module://...
• Fix crash with TkAgg on Windows with tk.window_focus: True
• Fix interactive update of SubFigures
• Fix interactivity when using the IPython console
• Fix pickling of AxesWidgets and SubFigures
• Fix scaling on GTK3Cairo / GTK4Cairo backends
• Fix text wrapping within SubFigures
• Promote mpltype Sphinx role to a public extension; note this is only intended for development reasons