build(deps): bump webpack-cli from 4.1.0 to 4.3.1 in /lib (wtho#47)

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 4.1.0 to 4.3.1.
- [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/webpack-cli@4.1.0...webpack-cli@4.3.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]