Update app.py

Corrected to from langchain_text_splitters import RecursiveCharacterTextSplitter

app.py

@@ -4,7 +4,8 @@
 # from ibm_watsonx_ai.metanames import EmbedTextParamsMetaNames
 # from ibm_watsonx_ai import Credentials
 # from langchain_ibm import WatsonxLLM, WatsonxEmbeddings
-from langchain.text_splitter import RecursiveCharacterTextSplitter
+
+from langchain_text_splitters import RecursiveCharacterTextSplitter
 from langchain_community.vectorstores import Chroma
 from langchain_community.document_loaders import PyPDFLoader
 from langchain.chains import RetrievalQA