Bump ws and @wordpress/scripts (#329)

Bumps [ws](https://github.com/websockets/ws) to 8.18.0 and updates ancestor dependency [@wordpress/scripts](https://github.com/WordPress/gutenberg/tree/HEAD/packages/scripts). These dependencies need to be updated together.


Updates `ws` from 8.13.0 to 8.18.0
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.13.0...8.18.0)

Updates `@wordpress/scripts` from 28.6.0 to 30.0.2
- [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/scripts@30.0.2/packages/scripts)

---
updated-dependencies:
- dependency-name: ws
  dependency-type: indirect
- dependency-name: "@wordpress/scripts"
  dependency-type: direct:development
...

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