python-engineio: 3.x on python 3.9 Darwin broken

The tests are failing, but the package appears to be generally broken for
python 3.9 and above on Darwin.

Co-authored-by: Jonathan Ringer <[e-mail]>

pkgs/development/python-modules/python-engineio/3.nix

···
 , websocket_client
 , websockets
 , pytestCheckHook
+, pythonAtLeast
 }:
 
 buildPythonPackage rec {
···
     homepage = "https://github.com/miguelgrinberg/python-engineio/";
     license = with licenses; [ mit ];
     maintainers = with maintainers; [ graham33 ];
+    broken = stdenv.isDarwin && (pythonAtLeast "3.9");  # See https://github.com/miguelgrinberg/python-socketio/issues/567
   };
 }