Updated imports and dependencies

app.py

@@ -1,7 +1,7 @@
 import streamlit as st
 import openai
 import os
-from langchain.document_loaders import PyPDFLoader
+from langchain_community.document_loaders import PyPDFLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.embeddings import OpenAIEmbeddings
 from langchain.vectorstores import FAISS

requirements.txt

@@ -2,6 +2,7 @@ streamlit>=1.28
 openai>=1.3
 python-dotenv>=1.0
 langchain>=0.0.340
+langchain-community>=0.0.1
 PyPDF2>=3.0
 faiss-cpu>=1.7
 elevenlabs>=0.2.12