diva: fix typing

titles/diva/handlers/user.py

@@ -140,7 +140,7 @@ class RegisterResponse(BaseResponse):
         self.pd_id: int = pv_id
 
 class EndRequest(BaseRequest):
-    def __init__(self, raw: str | bytes) -> None:
+    def __init__(self, raw: Union[str, bytes]) -> None:
         self.my_qst_id: str
         self.my_qst_sts: str