refactor: add Callable type import for type hints

Author: rusher

mariadb/impl/client/base_client.py

@@ -14,7 +14,7 @@
 import ipaddress
 import uuid
 from abc import ABC, abstractmethod
-from typing import List, Optional
+from typing import List, Optional, Callable
 
 from mariadb.impl.client.socket.read_stream import PacketBuffer