Bump webpack from 4.27.1 to 4.28.4 Bumps [webpack](https://github.com/webpack/webpack) from 4.27.1 to 4.28.4. - [Release notes](https://github.com/webpack/webpack/releases) - [Commits](https://github.com/webpack/webpack/compare/v4.27.1...v4.28.4) Signed-off-by: dependabot[bot]