Bump cookie and @wordpress/scripts (#778)

Bumps [cookie](https://github.com/jshttp/cookie) to 0.7.1 and updates ancestor dependency [@wordpress/scripts](https://github.com/WordPress/gutenberg/tree/HEAD/packages/scripts). These dependencies need to be updated together.


Updates `cookie` from 0.4.2 to 0.7.1
- [Release notes](https://github.com/jshttp/cookie/releases)
- [Commits](jshttp/cookie@v0.4.2...v0.7.1)

Updates `@wordpress/scripts` from 28.4.0 to 30.6.0
- [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/scripts@30.6.0/packages/scripts)

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

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