REL: v3.6.1

This is the first bugfix release of the 3.6.x series.

This release contains several bug-fixes and adjustments:

• A warning is no longer raised when constrained layout explicitly
  disabled and tight layout is applied
• Add missing get_cmap method to ColormapRegistry
• Adding a colorbar on a ScalarMappable that is not attached to an
  Axes is now deprecated instead of raising a hard error
• Fix barplot being empty when first element is NaN
• Fix FigureManager.resize on GTK4
• Fix fill_between compatibility with NumPy 1.24 development version
• Fix hexbin with empty arrays and log scaling
• Fix resize_event deprecation warnings when creating figure on macOS
• Fix build in mingw
• Fix compatibility with PyCharm's interagg backend
• Fix crash on empty Text in PostScript backend
• Fix generic font families in SVG exports
• Fix horizontal colorbars with hatches
• Fix misplaced mathtext using eqnarray
• stackplot no longer changes the Axes cycler