fix cython type error

app/api/endpoints/download.py

@@ -1,4 +1,4 @@
-from typing import Any, List, Annotated
+from typing import Any, List, Annotated, Optional
 
 from fastapi import APIRouter, Depends, Body
 
@@ -18,7 +18,7 @@ router = APIRouter()
 
 @router.get("/", summary="正在下载", response_model=List[schemas.DownloadingTorrent])
 def current(
-        name: str = None,
+        name: Optional[str] =  None,
         _: schemas.TokenPayload = Depends(verify_token)) -> Any:
     """
     查询正在下载的任务