Bump css-loader from 5.1.1 to 5.1.3 (#71)

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 5.1.1 to 5.1.3.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/css-loader@v5.1.1...v5.1.3)

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