Upload app.py with huggingface_hub

app.py

@@ -22,7 +22,7 @@ from langchain_community.vectorstores import Chroma
 from huggingface_hub import CommitScheduler
 from pathlib import Path
 
-from langchain_core.cache import BaseCache
+from langchain_core.caches import BaseCache
 from langchain_openai.chat_models import ChatOpenAI
 
 # Rebuild the model to fix the pydantic validation error