Bump webpack from 4.31.0 to 4.32.2

Bumps [webpack](https://github.com/webpack/webpack) from 4.31.0 to 4.32.2.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v4.31.0...v4.32.2)