Fixes CVE-2023-6816, CVE-2024-0229, CVE-2024-21885, CVE-2024-21886, CVE-2024-0409, and CVE-2024-0408. See the X.Org security advisory <https://lists.x.org/archives/xorg/2024-January/061525.html> for more information. Copyright line updated as followup to commits 3080abba40c819933d1857abe4abaaa3cf65baab and 158502e40d800407f1bd697dd5dd0437086730bf. * gnu/packages/xorg.scm (xorg-server): Update to 21.1.11. Change-Id: I07cb273e2a504f94f8f26624d26ad79c6e92f109 Signed-off-by: John Kehayias <john.kehayias@protonmail.com>