build(deps-dev): bump workbox-cli from 6.5.4 to 6.6.0

Bumps [workbox-cli](https://github.com/googlechrome/workbox) from 6.5.4 to 6.6.0.
- [Release notes](https://github.com/googlechrome/workbox/releases)
- [Commits](GoogleChrome/workbox@v6.5.4...v6.6.0)

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

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