Update app.py

app.py

@@ -6,7 +6,7 @@ from langchain.embeddings import HuggingFaceBgeEmbeddings
 from langchain.vectorstores import FAISS
 from langchain.prompts import ChatPromptTemplate, SystemMessagePromptTemplate, HumanMessagePromptTemplate
 from langchain.chains import LLMChain
-from langchain.output_parsers import StrOutputParser
+from langchain_core.output_parsers.string import StrOutputParser
 from langchain.chat_models import ChatOpenAI
 
 from sentence_transformers import SentenceTransformer