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/applications/version-management/git-and-tools/git/default.nix

@@ -343,6 +343,6 @@ stdenv.mkDerivation {
     '';
 
     platforms = stdenv.lib.platforms.all;
-    maintainers = with stdenv.lib.maintainers; [ peti the-kenny wmertens globin ];
+    maintainers = with stdenv.lib.maintainers; [ peti wmertens globin ];
   };
 }