Bump webpack-dev-server from 3.1.10 to 3.11.2

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.1.10 to 3.11.2.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/v3.11.2/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v3.1.10...v3.11.2)

Signed-off-by: dependabot[bot] <support@github.com>