chore(deps-dev): bump @wordpress/browserslist-config from 6.1.0 to 6.4.0

Bumps [@wordpress/browserslist-config](https://github.com/WordPress/gutenberg/tree/HEAD/packages/browserslist-config) from 6.1.0 to 6.4.0.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/browserslist-config/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/[email protected]/packages/browserslist-config)

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

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