Bump stylelint-scss from 3.11.1 to 3.12.0

Bumps [stylelint-scss](https://github.com/kristerkari/stylelint-scss) from 3.11.1 to 3.12.0.
- [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/3.11.1...3.12.0

)

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