feat: issue-2008 fix linter

fastapi/routing.py

@@ -931,6 +931,7 @@ class APIRouter(routing.Router):
         auto_options_index: Optional[int] = None
         allowed_methods: Set[str] = set()
         for index, route in enumerate(self.routes):
+            if isinstance(route, APIRoute):
                 if route.path == new_route.path:
                     if hasattr(route, "is_auto_options") and route.is_auto_options:
                         auto_options_index = index