Update for SCSS deprecations

[Joossensei]

This should fix the npm run build deprecations

[Joossensei]

There is also a deprecation in the bootstrap node_module but this is something bootstrap should fix I think.

For that to that manually is to go to node_modules/bootstrap/scss/mixins/_forms.scss and edit line 121:

From:
background: $custom-select-background, $custom-select-bg escape-svg($icon) math.div($custom-select-feedback-icon-position, $custom-select-feedback-icon-size) no-repeat;

To:
background: $custom-select-background, $custom-select-bg escape-svg($icon) list.slash($custom-select-feedback-icon-position, $custom-select-feedback-icon-size) no-repeat;

Also add @use "sass:list" at the top of the file

[bobdenotter]

Whoop! One step further in cleaning up deprecations! 👍