Bump del from 6.0.0 to 7.0.0 in /example

Bumps [del](https://github.com/sindresorhus/del) from 6.0.0 to 7.0.0.
- [Release notes](https://github.com/sindresorhus/del/releases)
- [Commits](sindresorhus/del@v6.0.0...v7.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>