Bumps [clean-css](https://github.com/jakubpawlowicz/clean-css) from 4.1.8 to 4.2.3.
- [Release notes](https://github.com/jakubpawlowicz/clean-css/releases)
- [Changelog](https://github.com/jakubpawlowicz/clean-css/blob/v4.2.3/History.md)
- [Commits](https://github.com/jakubpawlowicz/clean-css/compare/v4.1.8...v4.2.3

)

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Bumps [braces](https://github.com/micromatch/braces) from 1.8.5 to 2.3.2.
- [Release notes](https://github.com/micromatch/braces/releases)
- [Changelog](https://github.com/micromatch/braces/blob/master/CHANGELOG.md)
- [Commits](https://github.com/micromatch/braces/commits

)

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Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.7.0 to 3.13.1.
- [Release notes](https://github.com/nodeca/js-yaml/releases)
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodeca/js-yaml/compare/3.7.0...3.13.1

)

Signed-off-by: dependabot[bot] <support@github.com>