Silence mypy error

Author: abrookins

langgraph/checkpoint/redis/aio.py

@@ -411,7 +411,7 @@ async def aput(
         # store at top-level for filters in list()
         if all(key in metadata for key in ["source", "step"]):
             checkpoint_data["source"] = metadata["source"]
-            checkpoint_data["step"] = metadata["step"]
+            checkpoint_data["step"] = metadata["step"]  # type: ignore
 
         await self.checkpoints_index.load(
             [checkpoint_data],