Migrate langchain deps (#452)

examples/chatbot-simulation-evaluation/simulation_utils.py

@@ -1,6 +1,7 @@
 import functools
 from typing import Annotated, Any, Callable, Dict, List, Optional, Union
 
+from langchain_community.adapters.openai import convert_message_to_dict
 from langchain_core.messages import AIMessage, AnyMessage, BaseMessage, HumanMessage
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain_core.runnables import Runnable, RunnableLambda
@@ -21,7 +22,6 @@ def langchain_to_openai_messages(messages: List[BaseMessage]):
     Returns:
         List[dict]: A list of openai messages.
     """
-    from langchain.adapters.openai import convert_message_to_dict  # noqa: I001
 
     return [
         convert_message_to_dict(m) if isinstance(m, BaseMessage) else m