Backport v2022 <- v2023dev1: Update from debian/bullseye-security

Backport !22 (merged) to v2022

Fixes: https://phabricator.apertis.org/T8519

debian/changelog

-xorg-server (2:1.20.11-1+deb11u1+apertis1) UNRELEASED; urgency=medium
+xorg-server (2:1.20.11-1+deb11u1+apertis1) apertis; urgency=medium
 
-  * PLEASE SUMMARIZE remaining Apertis changes
+  * Sync updates from Debian Bullseye Security. Remaining Apertis specific changes:
+    + Add patch disable-libgl-in-xwayland.patch to disable glamor and
+      glxvnd in xwayland to avoid Xwayland depending on big GL.
 
  -- Apertis CI <devel@lists.apertis.org>  Thu, 23 Dec 2021 13:08:43 +0000