Bump stylelint from 11.1.1 to 13.12.0 (#255)

Bumps [stylelint](https://github.com/stylelint/stylelint) from 11.1.1 to 13.12.0.
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/master/CHANGELOG.md)
- [Commits](stylelint/stylelint@11.1.1...13.12.0)

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