Bump stylelint-scss from 3.18.0 to 3.19.0

Bumps [stylelint-scss](https://github.com/kristerkari/stylelint-scss) from 3.18.0 to 3.19.0.
- [Release notes](https://github.com/kristerkari/stylelint-scss/releases)
- [Changelog](https://github.com/kristerkari/stylelint-scss/blob/master/CHANGELOG.md)
- [Commits](stylelint-scss/stylelint-scss@3.18.0...3.19.0)

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