Bump wp-cli/checksum-command from 2.1.13 to 2.2.0 (#520)

Bumps [wp-cli/checksum-command](https://github.com/wp-cli/checksum-command) from 2.1.13 to 2.2.0.
- [Release notes](https://github.com/wp-cli/checksum-command/releases)
- [Commits](wp-cli/checksum-command@v2.1.13...v2.2.0)

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

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Author: dependabot[bot]