Migrate deprecated @import rules #422
Description
Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.
More info and automated migrator: https://sass-lang.com/d/import
Note that this issue is not an urgent thing to resolve, the version 3.0.0 will not be released soon, as even the version 2.0.0 hasn't been released yet. Maintainers expect the version 3.0.0 to be released in approximately 2 years.