update text splitter module

cve_factchecker/retriever.py

@@ -4,7 +4,7 @@ import math
 import re
 import time
 from typing import List, Dict, Any, Tuple, Optional
-from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain_text_splitters import RecursiveCharacterTextSplitter
 from langchain.schema import Document
 try:
     from langchain_chroma import Chroma  # type: ignore