chore(deps): bump loader-utils, react-styleguidist and postcss-modules

Bumps [loader-utils](https://github.com/webpack/loader-utils) to 1.4.2 and updates ancestor dependencies [loader-utils](https://github.com/webpack/loader-utils), [react-styleguidist](https://github.com/styleguidist/react-styleguidist) and [postcss-modules](https://github.com/css-modules/postcss-modules). These dependencies need to be updated together.


Updates `loader-utils` from 1.2.3 to 1.4.2
- [Release notes](https://github.com/webpack/loader-utils/releases)
- [Changelog](https://github.com/webpack/loader-utils/blob/v1.4.2/CHANGELOG.md)
- [Commits](webpack/loader-utils@v1.2.3...v1.4.2)

Updates `react-styleguidist` from 10.6.1 to 13.0.0
- [Release notes](https://github.com/styleguidist/react-styleguidist/releases)
- [Commits](styleguidist/react-styleguidist@v10.6.1...v13.0.0)

Updates `postcss-modules` from 1.4.1 to 1.5.0
- [Release notes](https://github.com/css-modules/postcss-modules/releases)
- [Changelog](https://github.com/madyankin/postcss-modules/blob/master/CHANGELOG.md)
- [Commits](madyankin/postcss-modules@v1.4.1...v1.5.0)

---
updated-dependencies:
- dependency-name: loader-utils
  dependency-type: indirect
- dependency-name: react-styleguidist
  dependency-type: direct:development
- dependency-name: postcss-modules
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>