Bump workbox-cli from 6.5.4 to 7.0.0 in /ui (#2737)

Bumps [workbox-cli](https://github.com/googlechrome/workbox) from 6.5.4 to 7.0.0.
- [Release notes](https://github.com/googlechrome/workbox/releases)
- [Commits](GoogleChrome/workbox@v6.5.4...v7.0.0)

---
updated-dependencies:
- dependency-name: workbox-cli
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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