Deprecated use of global `unquote` function in `getRgbaVar()`

[ElteHupkes]

The function getRgbaVar() in bulma/sass/utilities/css-variables.scss (current commit at the time of writing, current version in main) uses the function unquote() without the string. namespace:

@function getRgbaVar($name, $alpha, $prefix: "", $suffix: "") {
  $varName: buildVarName($name, $prefix, $suffix);
  @return unquote("rgba(var(#{$varName}), #{$alpha})");
}

This results in the following deprecation warning:

Deprecation Warning [global-builtin]: 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

   ╷
34 │   @return unquote("rgba(var(#{$varName}), #{$alpha})");
   │           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    node_modules/bulma/sass/utilities/css-variables.scss 34:11       getRgbaVar()
    [....truncated....]

Bulma version: 1.0.4
SASS version: 1.86.3, but this likely occurs with 1.80.x and up.

I'm guessing this one was missed when #3948 and #3907 were addressed.

[ElteHupkes]

Ah, I searched for duplicates in issues, but not in PRs. There is an open PR for this: #4006

[mateuswetah]

@jgthms would you mind taking a minute to check that PR? Seems fine for me.

For anyone facing this, you can pass --silence-deprecation=global-builtin temporally to get rid of the warnings, but it would really ideal if the issue was solved from the framework side.