chore: upgrade maplibre to v3

[JinIgarashi]

@smellman, @keichan34

Maplibre is now v3 which is not compatible with previous version and mapbox at all.
I tried to upgrade maplibre by myself, but I found a problem at getSpriteSlug function. Looks like the changes of multiple sprites support in v3 makes this function have an issue.

Could you please upgrade maplibre version to v3 at charites?

I upgraded maplibre to v3 at maplibre-gl-legend. Please use the following new CDN path when you will upgrade charites (I guess legend plugin included in current version of charites is no longer working)

<link
  href="https://www.unpkg.com/@watergis/maplibre-gl-legend@latest/dist/maplibre-gl-legend.css"
  rel="stylesheet"
/>
<script src="https://www.unpkg.com/@watergis/maplibre-gl-legend@latest/dist/maplibre-gl-legend.umd.js"></script>**

references

• https://github.com/maplibre/maplibre-gl-js/releases/tag/v3.0.0
• https://github.com/watergis/maplibre-gl-legend/blob/main/packages/maplibre-gl-legend/CHANGELOG.md

thanks

[smellman]

watergis/maplibre-gl-legend#11

[smellman]

I think dropping mapbox supports in next version because a test case can't run for mapbox.
Is it OK?