Update excel_chat.py

excel_chat.py

@@ -25,7 +25,7 @@ def ask_llm(query, input, client_index):
             model='mixtral-8x7b-32768',
         )
     else:
-        client = MistralClient(api_key=os.environ['MISTRAL_API_KEY']))
+        client = MistralClient(api_key=os.environ['MISTRAL_API_KEY'])
         chat_completion = client.chat(
             messages=messages,
             model='mistral-small-latest',