Bump webpack from 4.37.0 to 4.38.0 ( Bumps [webpack](https://github.com/webpack/webpack) from 4.37.0 to 4.38.0. - [Release notes](https://github.com/webpack/webpack/releases) - [Commits](https://github.com/webpack/webpack/compare/v4.37.0...v4.38.0) Signed-off-by: dependabot-preview[bot]