Clearly describe the bug

A follow-up from #5638, where the original issue was fixed correctly in my tests but more advanced scenarios still result in false positives, e.g. when using Sass' color.mix within rgba().

Which rule, if any, is the bug related to?

color-function-notation

What code is needed to reproduce the bug?

@use 'sass:color';

$color: rgba(color.mix(#000, #fff, 35%), 0.6);

What Stylelint configuration is needed to reproduce the bug?

{
  "rules": {
    "color-function-notation": "modern"
  }
}

Which version of Stylelint are you using?

14.0.1 as well as main from commit e2c3473.

How are you running stylelint: CLI, PostCSS plugin, Node.js API?

stylelint \"src/**/*.scss\"

Does the bug relate to non-standard syntax (e.g. SCSS, Less etc.)?

Yes, SCSS color functions

What did you expect to happen?

No errors

What actually happened (e.g. what warnings or errors did you get)?

 25:27  ✖  Expected legacy color-function notation  color-function-notation