x11-wm/magpie: update to 0.9.3

ChangeLog: https://github.com/BuddiesOfBudgie/magpie/releases/tag/v0.9.3

 * Remove toggle-shaded keyboard shortcut binding and associated code; GNOME 45
   has removed the associated schema since the toggle-shaded was considered
   broken capability
 * Add COGL default_driver option to allow certain architectures to be built
   with a specific driver name. It is recommended to leave this as the default
   'auto' for most architectures.

PR:		273523
Reported by:	duchateau.olivier@gmail.com (maintainer)