Fix user cache when updated user role (#483)

Author: wu-clan

backend/app/admin/service/user_service.py

@@ -135,7 +135,7 @@ async def update_roles(*, request: Request, username: str, obj: UpdateUserRolePa
                 if not role:
                     raise errors.NotFoundError(msg='角色不存在')
             await user_dao.update_role(db, input_user, obj)
-            await redis_client.delete(f'{settings.JWT_USER_REDIS_PREFIX}:{request.user.id}')
+            await redis_client.delete(f'{settings.JWT_USER_REDIS_PREFIX}:{input_user.id}')
 
     @staticmethod
     async def update_avatar(*, request: Request, username: str, avatar: AvatarParam) -> int: