chore(deps-dev): bump newspack-scripts from 5.8.0 to 5.9.0 (#405)

Bumps [newspack-scripts](https://github.com/Automattic/newspack-scripts) from 5.8.0 to 5.9.0.
- [Release notes](https://github.com/Automattic/newspack-scripts/releases)
- [Commits](Automattic/newspack-scripts@v5.8.0...v5.9.0)

---
updated-dependencies:
- dependency-name: newspack-scripts
  dependency-version: 5.9.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]