[cosmos] fix pylint (#40541)

* fix pylint

* missed

Author: l0lawrence

sdk/cosmos/azure-cosmos/azure/cosmos/aio/_global_endpoint_manager_async.py

@@ -25,7 +25,6 @@
 
 import asyncio # pylint: disable=do-not-import-asyncio
 import logging
-from asyncio import CancelledError
 from typing import Tuple
 
 from azure.core.exceptions import AzureError
@@ -105,7 +104,7 @@ async def refresh_endpoint_list(self, database_account, **kwargs):
             try:
                 await self.refresh_task
                 self.refresh_task = None
-            except (Exception, CancelledError) as exception: #pylint: disable=broad-exception-caught
+            except (Exception, asyncio.CancelledError) as exception: #pylint: disable=broad-exception-caught
                 logger.exception("Health check task failed: %s", exception)
         if self.location_cache.current_time_millis() - self.last_refresh_time > self.refresh_time_interval_in_ms:
             self.refresh_needed = True
@@ -217,5 +216,5 @@ async def close(self):
             self.refresh_task.cancel()
             try:
                 await self.refresh_task
-            except (Exception, CancelledError) : #pylint: disable=broad-exception-caught
+            except (Exception, asyncio.CancelledError) : #pylint: disable=broad-exception-caught
                 pass