python-modules/coordinates: remove mildlyincompetent from the maintainers list

also removed from maintainers-list.nix, motivation for change is
that he was a friend, and he unfortunately passed away earlier this year.

pkgs/development/python-modules/coordinates/default.nix

@@ -27,6 +27,6 @@ buildPythonPackage rec {
     description = "Convenience class for doing maths with explicit coordinates";
     homepage = "https://github.com/clbarnes/coordinates";
     license = licenses.mit;
-    maintainers = [ maintainers.mildlyincompetent ];
+    maintainers = [ ];
   };
 }