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/extensions/storage/azure_blob_storage.py

@@ -1,6 +1,5 @@
 from collections.abc import Generator
 from datetime import timedelta
-from typing import Optional
 
 from azure.identity import ChainedTokenCredential, DefaultAzureCredential
 from azure.storage.blob import AccountSasPermissions, BlobServiceClient, ResourceTypes, generate_account_sas
@@ -21,7 +20,7 @@ class AzureBlobStorage(BaseStorage):
         self.account_name = dify_config.AZURE_BLOB_ACCOUNT_NAME
         self.account_key = dify_config.AZURE_BLOB_ACCOUNT_KEY
 
-        self.credential: Optional[ChainedTokenCredential] = None
+        self.credential: ChainedTokenCredential | None = None
         if self.account_key == "managedidentity":
             self.credential = DefaultAzureCredential()
         else: