Migrate @import rules (CSS)

[MelSumner]

Reading through some of the recent logs and seeing the deprecation warning for Sass to move away from @import and use @use instead.

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

  ╷
1 │ @import 'variables/variables';
  │         ^^^^^^^^^^^^^^^^^^^^^
  ╵
    /tmp/broccoli-1843lUZ9qIu1ub44/out-138-funnel_funnel_styles/app/styles/app.scss 1:9  root stylesheet

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 'components/components';
  │         ^^^^^^^^^^^^^^^^^^^^^^^
  ╵
    /tmp/broccoli-1843lUZ9qIu1ub44/out-138-funnel_funnel_styles/app/styles/app.scss 3:9  root stylesheet

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

  ╷
4 │ @import 'object-patterns/object-patterns';
  │         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  ╵
    /tmp/broccoli-1843lUZ9qIu1ub44/out-138-funnel_funnel_styles/app/styles/app.scss 4:9  root stylesheet

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

  ╷
5 │ @import 'pages/pages';
  │         ^^^^^^^^^^^^^
  ╵
    /tmp/broccoli-1843lUZ9qIu1ub44/out-[138](https://github.com/ember-a11y/ember-a11y-testing/actions/runs/11606114498/job/32317636730?pr=558#step:5:139)-funnel_funnel_styles/app/styles/app.scss 5:9  root stylesheet

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

  ╷
6 │ @import 'typography/typography';
  │         ^^^^^^^^^^^^^^^^^^^^^^^
  ╵
    /tmp/broccoli-1843lUZ9qIu1ub44/out-138-funnel_funnel_styles/app/styles/app.scss 6:9  root stylesheet

WARNING: 11 repetitive deprecation warnings omitted.