Bump workbox-strategies from 5.1.3 to 6.4.2

Bumps [workbox-strategies](https://github.com/googlechrome/workbox) from 5.1.3 to 6.4.2.
- [Release notes](https://github.com/googlechrome/workbox/releases)
- [Commits](GoogleChrome/workbox@v5.1.3...v6.4.2)

---
updated-dependencies:
- dependency-name: workbox-strategies
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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