nixos/{redmine,murmur}: Add Felix Singer as maintainer

I'm maintaining the associated packages. So it makes sense to add myself
to their modules as well.

Signed-off-by: Felix Singer <felixsinger@posteo.net>

nixos/modules/services/misc/redmine.nix

@@ -448,4 +448,5 @@ in
 
   };
 
+  meta.maintainers = with lib.maintainers; [ felixsinger ];
 }

nixos/modules/services/networking/murmur.nix

@@ -406,4 +406,6 @@ in
       }
     '';
   };
+
+  meta.maintainers = with lib.maintainers; [ felixsinger ];
 }