Log Message:
modular-xorg-server: update to 21.1.9

This release contains fixes for CVE-2023-5367 and CVE-2023-5380 as
reported in today's security advisory:
https://lists.x.org/archives/xorg-announce/2023-October/003430.html

Additionally, the server now uses libbsd-overlay instead of libbsd.

Adam Jackson (1):
      present: Send a PresentConfigureNotify event for destroyed windows

Peter Hutterer (3):
      Xi/randr: fix handling of PropModeAppend/Prepend
      mi: reset the PointerWindows reference on screen switch
      xserver 21.1.9

Sam James (1):
      Switch to libbsd-overlay