update password type field textbox

app.py

@@ -95,7 +95,7 @@ with gr.Blocks() as demo:
   """)
   with gr.Row():
     question = gr.Textbox(label = 'Type in your questions about Gradio here', placeholder = 'What is the role of "every" argument in a component')
-    openai_api_key = gr.Textbox()
+    openai_api_key = gr.Textbox(type='password')
   state = gr.State()
   chatbot = gr.Chatbot()
   question.submit(chat, [question, state, openai_api_key], [chatbot, state])