Bump loader-utils and webpack-cli

Bumps [loader-utils](https://github.com/webpack/loader-utils) to 1.4.2 and updates ancestor dependency [webpack-cli](https://github.com/webpack/webpack-cli). These dependencies need to be updated together.


Updates `loader-utils` from 1.4.0 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@v1.4.0...v1.4.2)

Updates `webpack-cli` from 3.3.11 to 3.3.12
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](webpack/webpack-cli@v3.3.11...v3.3.12)

---
updated-dependencies:
- dependency-name: loader-utils
  dependency-type: indirect
- dependency-name: webpack-cli
  dependency-type: direct:development
...

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