Bump @ckeditor/ckeditor5-dev-utils from 20.0.0 to 43.0.0

Bumps [@ckeditor/ckeditor5-dev-utils](https://github.com/ckeditor/ckeditor5-dev/tree/HEAD/packages/ckeditor5-dev-utils) from 20.0.0 to 43.0.0.
- [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/v43.0.0/packages/ckeditor5-dev-utils)

---
updated-dependencies:
- dependency-name: "@ckeditor/ckeditor5-dev-utils"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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