treewide: remove wkennington as maintainer

He prefers to contribute to his own nixpkgs fork triton.
Since he is still marked as maintainer in many packages
this leaves the wrong impression he still maintains those.

pkgs/development/libraries/mtdev/default.nix

@@ -16,10 +16,9 @@ stdenv.mkDerivation rec {
       kernel MT events to the slotted type B protocol. The events put into
       mtdev may be from any MT device, specifically type A without contact
       tracking, type A with contact tracking, or type B with contact tracking.
-      See the kernel documentation for further details. 
+      See the kernel documentation for further details.
     '';
     license = licenses.mit;
     platforms = platforms.linux;
-    maintainers = with maintainers; [ wkennington ];
   };
 }