Update people responsible/notified for X11, xmonad, xmonad-contrib

Updated to match https://github.com/xmonad/xmonad/blob/master/MAINTAINERS.md

build-constraints.yaml

@@ -1725,7 +1725,6 @@ packages:
         - darcs
         - idris
         - libffi
-        - xmonad-contrib
         - cairo
         - glib
         - gio
@@ -2697,8 +2696,6 @@ packages:
         - streamproc
         - stringsearch # for cgi
         - titlecase
-        - X11
-        - xmonad
 
     "Mark Fine <mark.fine@gmail.com> @markfine":
         - postgresql-schema
@@ -4650,6 +4647,11 @@ packages:
     "Grzegorz Milka <grzegorzmilka@gmail.com> @gregorias":
         - trimdent
 
+    "xmonad <xmonad@haskell.org>":
+        - X11
+        - xmonad
+        - xmonad-contrib
+
     "Grandfathered dependencies":
         - snappy
         - quicklz
@@ -7805,6 +7807,13 @@ github-users:
         - bazel-runfiles
     network-multicast:
         - audreyt
+    xmonad:
+        - byorgey
+        - dmwit
+        - geekosaur
+        - liskin
+        - psibi
+        - slotThe
 
 # end of github-users