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/interpreters/erlang/generic-builder.nix

@@ -122,7 +122,7 @@ in stdenv.mkDerivation ({
     '';
 
     platforms = platforms.unix;
-    maintainers = with maintainers; [ the-kenny sjmackenzie couchemar gleber ];
+    maintainers = with maintainers; [ sjmackenzie couchemar gleber ];
     license = licenses.asl20;
   } // meta);
 }