Bumps [webpack](https://github.com/webpack/webpack) from 4.39.1 to 4.39.3.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/compare/v4.39.1...v4.39.3)
Signed-off-by: Ndependabot-preview[bot] <support@dependabot.com>