Fix Plotly yaxis titlefont -> title.font for newer Plotly compatibility

app.py

@@ -1325,8 +1325,7 @@ def create_downloads_bar_chart(model_data):
             linecolor='#2a2a40',
         ),
         yaxis=dict(
-            title="Downloads",
-            titlefont=dict(color='#a0a0b8'),
+            title=dict(text="Downloads", font=dict(color='#a0a0b8')),
             tickfont=dict(color='#a0a0b8'),
             gridcolor='#1a1a2e',
             linecolor='#2a2a40',