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/elixir/generic-builder.nix

@@ -73,6 +73,6 @@ in
 
       license = licenses.epl10;
       platforms = platforms.unix;
-      maintainers = with maintainers; [ the-kenny havvy couchemar ankhers filalex77 ];
+      maintainers = with maintainers; [ havvy couchemar ankhers filalex77 ];
     };
   })

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);
 }

pkgs/development/interpreters/scheme48/default.nix

@@ -6,7 +6,6 @@ stdenv.mkDerivation {
   meta = {
     homepage = "http://s48.org/";
     description = "Scheme 48";
-    maintainers = with stdenv.lib.maintainers; [ the-kenny ];
     platforms = with stdenv.lib.platforms; unix;
     license = stdenv.lib.licenses.bsd3;
   };