Bump sass-loader from 7.2.0 to 7.3.1

Bumps [sass-loader](https://github.com/webpack-contrib/sass-loader) from 7.2.0 to 7.3.1.
- [Release notes](https://github.com/webpack-contrib/sass-loader/releases)
- [Changelog](https://github.com/webpack-contrib/sass-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/sass-loader/compare/v7.2.0...v7.3.1

)

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