Tell pylint to shut its fat mouth.

I just want to return something I can refer to the attributes of via dot
syntax without having to pointlessly write the names both when I declare
the data class and when I assign the variables.

Such a stupid warning.

tests/unit/javascript/test_greasemonkey.py

@@ -165,6 +165,7 @@ class TestWindowIsolation:
 
     @pytest.fixture
     def setup(self):
+        # pylint: disable=attribute-defined-outside-init
         class SetupData:
             pass
         ret = SetupData()