Bump loader-utils, css-loader, extract-text-webpack-plugin, file-loader, sass-loader and webpack

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), [css-loader](https://github.com/webpack-contrib/css-loader), [extract-text-webpack-plugin](https://github.com/webpack-contrib/extract-text-webpack-plugin), [file-loader](https://github.com/webpack-contrib/file-loader), [sass-loader](https://github.com/webpack-contrib/sass-loader) and [webpack](https://github.com/webpack/webpack). These dependencies need to be updated together.


Updates `loader-utils` from 0.2.17 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@v0.2.17...v1.4.2)

Updates `css-loader` from 0.23.1 to 6.7.3
- [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@v0.23.1...v6.7.3)

Updates `extract-text-webpack-plugin` from 1.0.1 to 3.0.2
- [Release notes](https://github.com/webpack-contrib/extract-text-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/extract-text-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/extract-text-webpack-plugin@v1.0.1...v3.0.2)

Updates `file-loader` from 0.9.0 to 6.2.0
- [Release notes](https://github.com/webpack-contrib/file-loader/releases)
- [Changelog](https://github.com/webpack-contrib/file-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/file-loader@v0.9.0...v6.2.0)

Updates `sass-loader` from 4.0.2 to 13.2.2
- [Release notes](https://github.com/webpack-contrib/sass-loader/releases)
- [Changelog](https://github.com/webpack-contrib/sass-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/sass-loader@v4.0.2...v13.2.2)

Updates `webpack` from 1.15.0 to 5.81.0
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v1.15.0...v5.81.0)

---
updated-dependencies:
- dependency-name: loader-utils
  dependency-type: indirect
- dependency-name: css-loader
  dependency-type: direct:development
- dependency-name: extract-text-webpack-plugin
  dependency-type: direct:development
- dependency-name: file-loader
  dependency-type: direct:development
- dependency-name: sass-loader
  dependency-type: direct:development
- dependency-name: webpack
  dependency-type: direct:development
...

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

Author: dependabot[bot]