Bump webpack, file-loader, url-loader and webpack-cli

Bumps [webpack](https://github.com/webpack/webpack), [file-loader](https://github.com/webpack-contrib/file-loader), [url-loader](https://github.com/webpack-contrib/url-loader) and [webpack-cli](https://github.com/webpack/webpack-cli). These dependencies needed to be updated together.

Updates `webpack` from 4.46.0 to 5.94.0
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v4.46.0...v5.94.0)

Updates `file-loader` from 2.0.0 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@v2.0.0...v6.2.0)

Updates `url-loader` from 1.1.2 to 4.1.1
- [Release notes](https://github.com/webpack-contrib/url-loader/releases)
- [Changelog](https://github.com/webpack-contrib/url-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/url-loader@v1.1.2...v4.1.1)

Updates `webpack-cli` from 3.3.12 to 5.1.4
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/[email protected])

---
updated-dependencies:
- dependency-name: webpack
  dependency-type: direct:development
- dependency-name: file-loader
  dependency-type: direct:development
- dependency-name: url-loader
  dependency-type: direct:development
- dependency-name: webpack-cli
  dependency-type: direct:development
...

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