Sequence number in Event Data is of type int, not long (Azure#15801)

Author: ramya-rao-a

sdk/eventhub/azure-eventhub/azure/eventhub/_common.py

@@ -176,7 +176,7 @@ def sequence_number(self):
         # type: () -> Optional[int]
         """The sequence number of the event.
 
-        :rtype: int or long
+        :rtype: int
         """
         return self.message.annotations.get(PROP_SEQ_NUMBER, None)