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/tools/misc/yubikey-personalization-gui/default.nix

@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig qmake ];
   buildInputs = [ yubikey-personalization qtbase libyubikey ];
-  
+
   installPhase = ''
     mkdir -p $out/bin
     cp build/release/yubikey-personalization-gui $out/bin
@@ -21,6 +21,5 @@ stdenv.mkDerivation rec {
     description = "A QT based cross-platform utility designed to facilitate reconfiguration of the Yubikey";
     license = licenses.bsd2;
     platforms = platforms.unix;
-    maintainers = with maintainers; [ wkennington ];
   };
 }