[EventHub] skip if 3.8 (Azure#40449)

Author: swathipil

sdk/eventhub/azure-eventhub/tests/pyamqp_tests/unittest/asynctests/test_websocket_exception_async.py

@@ -8,8 +8,8 @@
 # class WebsocketException(unittest.TestCase):
 @pytest.mark.asyncio
 @pytest.mark.skipif(
-    not pytest.importorskip("aiohttp", reason="aiohttp is required for this test"),
-    reason="aiohttp is not installed"
+    sys.version_info < (3, 9),
+    reason="Python 3.8 or less is not supported for this test"
 )
 async def test_websocket_aiohttp_exception_async():
     import aiohttp