Sass-3 warnings with Themes on GitHub

Help
1

Given this warning:

Deprecation Warning [import]: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

Docs say @import needs to be replaced with @use but its not as simple as just doing that.

Are there any moves to update any of the themes at {GitHub Pages themes · GitHub](GitHub Pages themes · GitHub) especially the first 6 (Have any been updated?)
I was using leap-day. cayman hasn’t been updated, tried that

PS Tried all of the first 6 listed and they use @import

2

Do you know about a good tutorial on how to make this sass update? The template theme I am currently a maintainer is also experiencing this.