Removes [yaml](https://github.com/eemeli/yaml). It's no longer used after updating ancestor dependency [postcss-loader](https://github.com/webpack-contrib/postcss-loader). These dependencies need to be updated together. Removes `yaml` Updates `postcss-loader` from 4.1.0 to 7.2.4 - [Release notes](https://github.com/webpack-contrib/postcss-loader/releases) - [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md) - [Commits](https://github.com/webpack-contrib/postcss-loader/compare/v4.1.0...v7.2.4) --- updated-dependencies: - dependency-name: yaml dependency-type: indirect - dependency-name: postcss-loader dependency-type: direct:development ... Signed-off-by: dependabot[bot] <support@github.com>