dino: add tomfitzhenry as maintainer (#159701)

pkgs/applications/networking/instant-messengers/dino/default.nix

···
     homepage = "https://github.com/dino/dino";
     license = licenses.gpl3Plus;
     platforms = platforms.linux ++ platforms.darwin;
-    maintainers = with maintainers; [ qyliss ];
+    maintainers = with maintainers; [ qyliss tomfitzhenry ];
   };
 }