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/networking/dropbox/cli.nix

@@ -64,7 +64,6 @@ stdenv.mkDerivation {
     homepage = "https://www.dropbox.com";
     description = "Command line client for the dropbox daemon";
     license = stdenv.lib.licenses.gpl3Plus;
-    maintainers = with stdenv.lib.maintainers; [ the-kenny ];
     # NOTE: Dropbox itself only works on linux, so this is ok.
     platforms = stdenv.lib.platforms.linux;
   };