py-matplotlib: updated to 3.6.3

Matplotlib 3.6.3

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|

(adam)