Update app.py

app.py

@@ -33,7 +33,6 @@ from app_groq import demo as demo_groq
 from app_groq_coder import demo as demo_groq_coder
 from app_openai_coder import demo as demo_openai_coder
 from app_langchain import demo as demo_langchain
-from app_mistral import demo as demo_mistral
 from app_minimax import demo as demo_minimax
 from utils import get_app