NPM Dev(deps-dev): Bump @wordpress/scripts from 30.19.0 to 30.21.0

Bumps [@wordpress/scripts](https://github.com/WordPress/gutenberg/tree/HEAD/packages/scripts) from 30.19.0 to 30.21.0.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/scripts/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/[email protected]/packages/scripts)

---
updated-dependencies:
- dependency-name: "@wordpress/scripts"
  dependency-version: 30.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]