Bump stylelint-scss from 3.6.1 to 3.8.0

Bumps [stylelint-scss](https://github.com/kristerkari/stylelint-scss) from 3.6.1 to 3.8.0.
- [Release notes](https://github.com/kristerkari/stylelint-scss/releases)
- [Changelog](https://github.com/kristerkari/stylelint-scss/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kristerkari/stylelint-scss/compare/3.6.1...3.8.0)