Fix Gradio Dropdown parameter error

Replace 'searchable' with 'interactive' parameter as searchable
is not available in the Gradio version used by HF Spaces

app.py

@@ -287,7 +287,7 @@ with gr.Blocks(title="Canadian Parliamentary Expenditures", theme=gr.themes.Soft
         member_dropdown = gr.Dropdown(
             choices=member_names,
             label="Select a Member",
-            searchable=True
+            interactive=True
         )
         member_info = gr.Markdown()
         member_plot = gr.Plot()