style: fix quote style in test_base.py to match ruff format

Co-Authored-By: Alex Reibman <[email protected]>

tests/integration/test_base.py

@@ -24,7 +24,7 @@ async def async_setup_method(self, method):
 
     async def teardown_method(self, method):
         """Clean up after test."""
-        if hasattr(self, 'provider'):
+        if hasattr(self, "provider"):
             self.provider.undo_override()
 
     async def async_verify_events(self, session, expected_count=1):