treewide: remove the-kenny from maintainers

@the-kenny did a good job in the past and is set as maintainer in many package,
however since 2017-2018 he stopped contributing. To create less confusion
in pull requests when people try to request his feedback, I removed him as
maintainer from all packages.

pkgs/development/compilers/avra/default.nix

@@ -24,6 +24,5 @@ stdenv.mkDerivation rec {
     homepage = "http://avra.sourceforge.net/";
     license = licenses.gpl2Plus;
     platforms = platforms.all;
-    maintainers = with maintainers; [ the-kenny ];
   };
 }