Bump cloudbees-folder from 6.15 to 6.16 (#5632)

Bumps [cloudbees-folder](https://github.com/jenkinsci/cloudbees-folder-plugin) from 6.15 to 6.16.
- [Release notes](https://github.com/jenkinsci/cloudbees-folder-plugin/releases)
- [Commits](https://github.com/jenkinsci/cloudbees-folder-plugin/compare/cloudbees-folder-6.15...cloudbees-folder-6.16

)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.plugins:cloudbees-folder
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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