[Serve] Use pickle instead of clouldpickle (#9479)

python/ray/serve/router.py

@@ -3,10 +3,10 @@ import copy
 from collections import defaultdict, deque
 import time
 from typing import DefaultDict, List
+import pickle
 
 import blist
 
-import ray.cloudpickle as pickle
 from ray.exceptions import RayTaskError
 
 import ray
@@ -50,7 +50,7 @@ class Query:
         # worker without removing async_future.
         clone = copy.copy(self).__dict__
         clone.pop("async_future")
-        return pickle.dumps(clone, protocol=5)
+        return pickle.dumps(clone)
 
     @staticmethod
     def ray_deserialize(value):