Update test/asynchronous/test_server_selection_rtt.py

Co-authored-by: Noah Stapp <noah@noahstapp.com>

Author: sleepyStick

test/asynchronous/test_server_selection_rtt.py

@@ -35,7 +35,7 @@
     TEST_PATH = os.path.join(Path(__file__).resolve().parent.parent, "server_selection/rtt")
 
 
-class TestAllScenarios(unittest.IsolatedAsyncioTestCase):
+class TestAllScenarios(AsyncPyMongoTestCase):
     pass