update to use objects from databricks_langchain

chain.py

@@ -5,9 +5,10 @@ import streamlit as st
 from functools import partial
 from operator import itemgetter
 from langchain_huggingface import HuggingFaceEmbeddings
-from langchain_databricks.vectorstores import DatabricksVectorSearch
+# from langchain_databricks.vectorstores import DatabricksVectorSearch # this is the version we were previously using
+from databricks_langchain import DatabricksVectorSearch, ChatDatabricks # new version resolving deprecation warning
 # from langchain_community.chat_models import ChatDatabricks # lets be consistent with the packages were using
-from langchain_databricks import ChatDatabricks
+# from langchain_databricks import ChatDatabricks # this is the version we were previously using
 # from langchain_community.vectorstores import DatabricksVectorSearch # is this causing an issue?
 from langchain_core.runnables import RunnableLambda
 from langchain_core.output_parsers import StrOutputParser

requirements.txt

@@ -3,6 +3,7 @@ transformers
 databricks
 langchain
 langchain_core
+databricks_langchain
 langchain-databricks
 langchain-community
 langchain-huggingface