matplotlib/matplotlib: REL: v3.6.3

This is the third bugfix release of the 3.6.x series. This release contains several bug-fixes and adjustments: Fix Artist removal from axes_grid1 Axes classes Fix inset_locator in subfigures Fix scatter on masked arrays with units Fix colorbar ticks with log norm contours Fix deprecation warnings in GTK4 backend Fix using relative paths in HTMLWriter Improve failure message from rcParams string validation for tuple inputs Improve performance of QtAgg backends No longer modify pil_kwargs argument to imsave and savefig