Update test/asynchronous/test_discovery_and_monitoring.py

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

Author: sleepyStick

test/asynchronous/test_discovery_and_monitoring.py

@@ -138,7 +138,7 @@ def get_type(topology, hostname):
     return description.server_type
 
 
-class TestAllScenarios(unittest.IsolatedAsyncioTestCase):
+class TestAllScenarios(AsyncUnitTest):
     pass