Bump @ckeditor/ckeditor5-dev-webpack-plugin from 23.5.1 to 23.6.0

Bumps [@ckeditor/ckeditor5-dev-webpack-plugin](https://github.com/ckeditor/ckeditor5-dev/tree/HEAD/packages/ckeditor5-dev-webpack-plugin) from 23.5.1 to 23.6.0.
- [Release notes](https://github.com/ckeditor/ckeditor5-dev/releases)
- [Changelog](https://github.com/ckeditor/ckeditor5-dev/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ckeditor/ckeditor5-dev/commits/v23.6.0/packages/ckeditor5-dev-webpack-plugin

)

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