Bump webpack-dev-server in /week-7-frontend/frontend

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 3.1.10 to 3.10.1.
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/v3.10.1/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v3.1.10...v3.10.1)

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

Author: dependabot[bot]