Update src/streamlit_app.py

src/streamlit_app.py

@@ -8,7 +8,7 @@ import io
 from langchain_text_splitters import RecursiveCharacterTextSplitter
 from langchain_community.vectorstores import FAISS
 from langchain_community.embeddings import HuggingFaceEmbeddings
-from langchain.docstore.document import Document
+from langchain_core.documents import Document
 
 # 嘗試匯入 pypdf
 try: