refactor(utils/context): remove redundant iter call

Co-authored-by: Tzu-ping Chung <[email protected]>

airflow/utils/context.py

@@ -208,7 +208,7 @@ def __str__(self) -> str:
         return f"OutletEventAccessors(_dict={self._dict})"
 
     def __iter__(self) -> Iterator[Asset | AssetAlias]:
-        return iter(
+        return (
             key.to_asset() if isinstance(key, AssetUniqueKey) else key.to_asset_alias() for key in self._dict
         )