[BUG]: `@import` is deprecated

[jendrikw]

Description

When using import "plotly.js/src/css/style.scss" in my code (using vite), I get a lot of deprecation warnings:

Deprecation Warning [import]: 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 "vars.scss";
  │         ^^^^^^^^^^^
  ╵
    ../../../plotly.js/src/css/style.scss 1:9  root stylesheet

Deprecation Warning [import]: 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 "mixins.scss";
  │             ^^^^^^^^^^^^^
  ╵
    ../../../plotly.js/src/css/style.scss 4:13  root stylesheet

Deprecation Warning [import]: 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 "base.scss";
  │             ^^^^^^^^^^^
  ╵
    ../../../plotly.js/src/css/style.scss 5:13  root stylesheet

Deprecation Warning [import]: 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 "cursor.scss";
  │             ^^^^^^^^^^^^^
  ╵
    ../../../plotly.js/src/css/style.scss 6:13  root stylesheet

Deprecation Warning [import]: 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

  ╷
7 │     @import "modebar.scss";
  │             ^^^^^^^^^^^^^^
  ╵
    ../../../plotly.js/src/css/style.scss 7:13  root stylesheet

Steps to reproduce

https://stackblitz.com/edit/vitest-dev-vitest-k9muhcrx?file=package.json

Notes

Add info here that doesn't fit in the other sections.