rabbitmq: Remove Profpatsch as maintainer

I have effectively not really maintained it in a while, since I had no
use-case.

Now that ryantm-bot has stopped reacting to updates of the package, I
don’t see this improving.

I hope somebody else steps up, an up-to-date rabbitmq in nixpkgs is
quite important.

pkgs/servers/amqp/rabbitmq-server/default.nix

@@ -83,6 +83,6 @@ stdenv.mkDerivation rec {
     description = "An implementation of the AMQP messaging protocol";
     license = licenses.mpl20;
     platforms = platforms.unix;
-    maintainers = with maintainers; [ Profpatsch ];
+    maintainers = with maintainers; [ ];
   };
 }