chore: add ast-grep rule to convert Optional[T] to T | None (#25560)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/core/helper/model_provider_cache.py

@@ -1,7 +1,6 @@
 import json
 from enum import StrEnum
 from json import JSONDecodeError
-from typing import Optional
 
 from extensions.ext_redis import redis_client
 
@@ -16,7 +15,7 @@ class ProviderCredentialsCache:
     def __init__(self, tenant_id: str, identity_id: str, cache_type: ProviderCredentialsCacheType):
         self.cache_key = f"{cache_type}_credentials:tenant_id:{tenant_id}:id:{identity_id}"
 
-    def get(self) -> Optional[dict]:
+    def get(self) -> dict | None:
         """
         Get cached model provider credentials.