remove remaining imports of typing_extensions (#3873)

* remove remaining imports of typing_extensions

* Applying review comments

---------

Co-authored-by: petyaslavova <petya.slavova@redis.com>

Author: dotlambda

redis/multidb/config.py

@@ -1,9 +1,8 @@
 from dataclasses import dataclass, field
 from enum import Enum
-from typing import List, Type, Union
+from typing import List, Optional, Type, Union
 
 import pybreaker
-from typing_extensions import Optional
 
 from redis import ConnectionPool, Redis, RedisCluster
 from redis.backoff import ExponentialWithJitterBackoff, NoBackoff

redis/multidb/failure_detector.py

@@ -2,9 +2,7 @@
 import threading
 from abc import ABC, abstractmethod
 from datetime import datetime, timedelta
-from typing import List, Type
-
-from typing_extensions import Optional
+from typing import List, Optional, Type
 
 from redis.multidb.circuit import State as CBState