[Security] Bump webpack-dev-server from 2.7.1 to 3.1.11

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 2.7.1 to 3.1.11. **This update includes a security fix.**
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v2.7.1...v3.1.11)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]