fix: 兼容后台修改永久取件

apps/admin/schemas.py

@@ -1,5 +1,6 @@
 import datetime
-from typing import Optional
+from typing import Optional, Union
+
 from pydantic import BaseModel
 
 
@@ -26,5 +27,5 @@ class UpdateFileData(BaseModel):
     code: Optional[str] = None
     prefix: Optional[str] = None
     suffix: Optional[str] = None
-    expired_at: Optional[datetime.datetime] = None
+    expired_at: Optional[Union[datetime.datetime, str]] = None
     expired_count: Optional[int] = None