Bump ckeditor4-angular from 3.1.0 to 4.0.1

Bumps [ckeditor4-angular](https://github.com/ckeditor/ckeditor4-angular) from 3.1.0 to 4.0.1.
- [Changelog](https://github.com/ckeditor/ckeditor4-angular/blob/master/CHANGELOG.md)
- [Commits](ckeditor/ckeditor4-angular@v3.1.0...v4.0.1)

---
updated-dependencies:
- dependency-name: ckeditor4-angular
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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