Update choices.scss

[tungChasqui]

Using / for division is deprecated and will be removed in Dart Sass 2.0.0

Description

When attaching the library to my app with laravel mix it was throwing an error with dart sass version 2.0.0
More info and automated migrator: https://sass-lang.com/d/slash-div

Screenshots (if appropriate)

Types of changes

• Chore (tooling change or documentation change)
• Refactor (non-breaking change which maintains existing functionality)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[OzzyCzech]

+1 for merging this pull request

[clement-meunier]

In your commit, I think this element is missing at the top of the file :
@use "sass:math";

[mtriff]

Closing in favour of #976