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/arduino/ino/default.nix

@@ -40,7 +40,7 @@ python2Packages.buildPythonApplication rec {
     description = "Command line toolkit for working with Arduino hardware";
     homepage = "http://inotool.org/";
     license = stdenv.lib.licenses.mit;
-    maintainers = with stdenv.lib.maintainers; [ antono the-kenny ];
+    maintainers = with stdenv.lib.maintainers; [ antono ];
     platforms = stdenv.lib.platforms.linux;
   };
 }