Carto basemap link not working in our doc examples for UrlTemplateImageryProvider

[lukemckinstry]

What happened?

In our docs for UrlTemplateImageryProvider, the basemap service from Carto is not loading imagery on the globe. It appears the service is still active https://github.com/CartoDB/basemap-styles.

The following code does not load tiles in sandcastle

const viewer = new Cesium.Viewer('cesiumContainer', {
    imageryProvider: new Cesium.UrlTemplateImageryProvider({
        url: 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
        subdomains: 'abcd', // Carto supports these subdomains
        credit: '© CartoDB'
    }),
    baseLayerPicker: false // Disable default base layers if you only want the Carto basemap
});

Reproduction steps

...

Sandcastle example

No response

Environment

Browser:
CesiumJS Version:
Operating System: