Bump the wp-cli-packages group with 2 updates

Bumps the wp-cli-packages group with 2 updates: [wp-cli/extension-command](https://github.com/wp-cli/extension-command) and [wp-cli/wp-cli-tests](https://github.com/wp-cli/wp-cli-tests).


Updates `wp-cli/extension-command` from 2.1.15 to 2.1.16
- [Release notes](https://github.com/wp-cli/extension-command/releases)
- [Commits](wp-cli/extension-command@v2.1.15...v2.1.16)

Updates `wp-cli/wp-cli-tests` from 4.2.2 to 4.2.9
- [Release notes](https://github.com/wp-cli/wp-cli-tests/releases)
- [Commits](wp-cli/wp-cli-tests@v4.2.2...v4.2.9)

---
updated-dependencies:
- dependency-name: wp-cli/extension-command
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: wp-cli-packages
- dependency-name: wp-cli/wp-cli-tests
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: wp-cli-packages
...

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