Bug: Deprecation of global built-in functions for Dart Sass 3.0.0

[ahosgood]

Bug description

When building the SCSS using sass (v1.79.5), I get some deprecation warnings for an upcoming version of Dart Sass.

Some are about @import but those are covered in #19167 and #20501.

Others are about global built-in functions:

Deprecation Warning: Global built-in functions are deprecated and will be removed in Dart Sass 3.0.0.
Use string.unquote instead.

More info and automated migrator: https://sass-lang.com/d/import

   ╷
32 │     #{$fa-icon-property}: unquote('"#{ $icon }"');
   │                           ^^^^^^^^^^^^^^^^^^^^^^^
   ╵

Reproducible test case

https://github.com/nationalarchives/tna-frontend

Screenshots

To reproduce on our repo:

npm i
npm run compile:sass

Example output can be found in https://github.com/nationalarchives/tna-frontend/actions/runs/12599661104/job/35117055940 under "Test build package"

Font Awesome version

v6.7.2

Serving

Self-hosted

Implementation

CSS

Browser and Operating System

NodeJS Jod (22.x)

Web bug report checklist

• I have included a test case because my odds go way up that the team can fix this when I do
• I have searched for existing issues and to the best of my knowledge this is not a duplicate

[tagliala]

Great, this is a good chance to make the breaking changes for #17644