chore: enforce more ruff rules (#31447)

Co-authored-by: Elizabeth Thompson <eschutho@gmail.com>

tests/integration_tests/css_templates/api_tests.py

@@ -50,7 +50,7 @@ class TestCssTemplateApi(SupersetTestCase):
         db.session.commit()
         return css_template
 
-    @pytest.fixture()
+    @pytest.fixture
     def create_css_templates(self):
         with self.create_app().app_context():
             css_templates = []