Deprecation Warning: Sass @import rules are deprecated

[f18m]

Hi,
trying to use this theme with Jekyll I get this type of warning:

Deprecation Warning: 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

  ╷
3 │ @import "colors";
  │         ^^^^^^^^
  ╵
    /home/fmontorsi/Documents/f18m.github.io/assets/css/colors-auto-default-dark.scss 3:9  root stylesheet
Deprecation Warning: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

and many others.. looks like @import is deprecated since 2019: https://sass-lang.com/blog/import-is-deprecated/