Bump webpack from 4.39.1 to 4.39.3 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: dependabot-preview[bot]