Update app.py to change model_id for free tier

app.py

@@ -30,7 +30,7 @@ class BasicAgent:
         model = HfApiModel(
             max_tokens=2096,
             temperature=0.0,
-            model_id='Qwen/Qwen2.5-Coder-32B-Instruct',# it is possible that this model may be overloaded
+            model_id='ollama/qwen2.5-coder:7b',# it is possible that this model may be overloaded
             custom_role_conversions=None,
         )