Bump wp-cli/package-command from 2.6.1 to 2.7.0 (#918)

Bumps [wp-cli/package-command](https://github.com/wp-cli/package-command) from 2.6.1 to 2.7.0.
- [Release notes](https://github.com/wp-cli/package-command/releases)
- [Commits](wp-cli/package-command@v2.6.1...v2.7.0)

---
updated-dependencies:
- dependency-name: wp-cli/package-command
  dependency-version: 2.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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