Bump wp-cli/wp-cli-bundle from 2.8.1 to 2.9.0 (#407)

Bumps [wp-cli/wp-cli-bundle](https://github.com/wp-cli/wp-cli-bundle) from 2.8.1 to 2.9.0.
- [Release notes](https://github.com/wp-cli/wp-cli-bundle/releases)
- [Commits](wp-cli/wp-cli-bundle@v2.8.1...v2.9.0)

---
updated-dependencies:
- dependency-name: wp-cli/wp-cli-bundle
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>