updated text splitter

src/kaira-agent.py

@@ -4,7 +4,7 @@ import numpy as np
 import pandas as pd
 import faiss
 from langchain_community.document_loaders import PyPDFLoader
-from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain_text_splitters import RecursiveCharacterTextSplitter
 from sentence_transformers import SentenceTransformer
 import cohere
 # pip install cohere