change to mistral model

app.py

@@ -43,7 +43,7 @@ model = HfApiModel(
 max_tokens=2096,
 temperature=0.5,
 #model_id='Qwen/Qwen2.5-Coder-32B-Instruct',# it is possible that this model may be overloaded
-model_id = 'meta-llama/Llama-3.2-3B-Instruct',    
+model_id = 'Mistral-7B-Instruct-v0.3',    
 custom_role_conversions=None,
 )