Update app.py

app.py

@@ -1,7 +1,7 @@
 import streamlit as st
 from dotenv import load_dotenv
 from PyPDF2 import PdfReader
-from langchain.text_splitter import CharacterTextSplitter
+from langchain_text_splitter import CharacterTextSplitter
 from langchain.embeddings import OpenAIEmbeddings, HuggingFaceEmbeddings
 from langchain.vectorstores import FAISS
 from langchain.chat_models import ChatOpenAI