Fix untyped call

fastapi/routing.py

@@ -4450,7 +4450,18 @@ class APIRouter(routing.Router):
 
         return decorator
 
-    def combine_tags(self, *entities):
+    def combine_tags(
+            self,
+            *entities: Annotated[
+                None | str | routing.Route | Iterable,
+                Doc(
+                    """
+                    Combine the router's current tags with those of the provided entities.
+                    Supports None, strings, iterables, and Route objects with a `tags` attribute.
+                    """
+                ),
+            ]
+    ) -> List[str]:
         tags = set(self.tags or [])
         for entity in entities:
             if entity is None: