OSM tiles blocked on Google Colab

Just noticed that OSM tiles no longer work properly on Google Colab even though ipyleaflet shows the `OpenStreetMap contributors` in the attribution. 

https://wiki.openstreetmap.org/wiki/Blocked_tiles

<img width="1089" height="526" alt="Image" src="https://github.com/user-attachments/assets/a08d5096-a69d-49f4-9689-ff8f7db7c022" />