Support _StrPromise

Author: Qu4tro

rest_framework-stubs/exceptions.pyi

@@ -1,6 +1,7 @@
 from typing import Any, Dict, List, Optional, Sequence, Union
 
 from django.http import HttpRequest, JsonResponse
+from django.utils.functional import _StrPromise
 from rest_framework.renderers import BaseRenderer
 from rest_framework.request import Request
 
@@ -12,7 +13,7 @@ class ErrorDetail(str):
     code: Optional[str] = None
     def __new__(cls, string: str, code: Optional[str] = ...): ...
 
-_Detail = Union[str, List[Any], Dict[str, Any]]
+_Detail = Union[str, _StrPromise, List[Any], Dict[str, Any]]
 
 class APIException(Exception):
     status_code: int = ...