NPM Dev(deps-dev): Bump @wordpress/i18n from 6.7.0 to 6.8.0

Bumps [@wordpress/i18n](https://github.com/WordPress/gutenberg/tree/HEAD/packages/i18n) from 6.7.0 to 6.8.0.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/i18n/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/i18n@6.8.0/packages/i18n)

---
updated-dependencies:
- dependency-name: "@wordpress/i18n"
  dependency-version: 6.8.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]