Bump webpack-cli from 3.0.3 to 3.0.8 in /apps/oauth2

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.0.3 to 3.0.8.
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/v3.0.3...v3.0.8

)

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