fix(csp): protomaps sources

[curbengh]

add protomaps github pages url to CSP connect-src when using protomaps api for maplibre. protomaps hosts glyphs and sprite on their github pages.

https://api.protomaps.com/styles/v5/light/en.json?key=MY_KEY

{
  "version": 8,
  "name": "[email protected] flavor@light lang@en",
  "glyphs": "https://protomaps.github.io/basemaps-assets/fonts/{fontstack}/{range}.pbf",
  "sprite": "https://protomaps.github.io/basemaps-assets/sprites/v4/light",
  "sources": {
    "protomaps": {
      "attribution": "<a href=\"https://github.com/protomaps/basemaps\">Protomaps</a> © <a href=\"https://openstreetmap.org\">OpenStreetMap</a>",
      "type": "vector",
      "tiles": [
        "https://api.protomaps.com/tiles/v4/{z}/{x}/{y}.mvt?key=MY_KEY"
      ],
      "maxzoom": 15
    }
  }
}