Bump webpack-dev-server from 4.15.1 to 5.0.2

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 4.15.1 to 5.0.2.
- [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@v4.15.1...v5.0.2)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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