Update app.py

Changed to newer mistral model

app.py

@@ -52,7 +52,7 @@ def handle_submit():
         completion = client.chat.completions.create(
             #model="Qwen/Qwen2.5-72B-Instruct",
             #model="Qwen/Qwen2.5-Coder-32B-Instruct",
-            model="mistralai/Mixtral-8x7B-Instruct-v0.1",
+            model="mistralai/Mistral-7B-Instruct-v0.3",
             messages=messages,
             max_tokens=1000
         )