Created and linked TypeAlias 3.9 fallback to new ticket.

Author: caseyclements

libs/langchain-mongodb/langchain_mongodb/graphrag/graph.py

@@ -23,8 +23,8 @@
 if TYPE_CHECKING:
     try:
         from typing import TypeAlias  # type:ignore[attr-defined] # Python 3.10+
-    except ImportError:
-        from typing_extensions import TypeAlias  # Python 3.9 fallback
+    except ImportError:  # Python 3.9 fallback  # TODO Remove [PYTHON-5658]
+        from typing_extensions import TypeAlias
 
     Entity: TypeAlias = Dict[str, Any]
     """Represents an Entity in the knowledge graph with specific schema. See .schema"""