style: sort typing imports in request_verification

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: zimeg

slack_bolt/middleware/request_verification/request_verification.py

@@ -1,5 +1,5 @@
 from logging import Logger
-from typing import Callable, Dict, Any, Optional
+from typing import Any, Callable, Dict, Optional
 
 from slack_sdk.signature import SignatureVerifier