Dropdown.update is deprecated. so remove it

app.py

@@ -103,11 +103,11 @@ def reset_user_input():
 
 def reset_state():
     history = gr.State(init_history)
-    return '', '', [], gr.Dropdown.update(value=None, interactive=False)
+    return '', '', [], gr.Dropdown(value=None, interactive=False)
 
 
 def allow_user_input():
-    return gr.Dropdown.update(interactive=True)
+    return gr.Dropdown(interactive=True)
 
 
 with gr.Blocks() as demo: