Update app.py

app.py

@@ -1,6 +1,6 @@
 from pymongo import MongoClient
 # error since Jan 2024, from langchain.embeddings.openai import OpenAIEmbeddings
-from langchain.embeddings import OpenAIEmbeddings
+from langchain_community.embeddings import OpenAIEmbeddings
 # error since Jan 2024, from langchain.vectorstores import MongoDBAtlasVectorSearch
 from langchain_community.vectorstores import MongoDBAtlasVectorSearch
 # error since Jan 2024, from langchain.document_loaders import DirectoryLoader