Bump cloudbees-folder from 6.14 to 6.15
Bump cloudbees-folder from 6.14 to 6.15

Bumps [cloudbees-folder](https://github.com/jenkinsci/cloudbees-folder-plugin) from 6.14 to 6.15.
- [Release notes](https://github.com/jenkinsci/cloudbees-folder-plugin/releases)
- [Commits](https://github.com/jenkinsci/cloudbees-folder-plugin/compare/cloudbees-folder-6.14...cloudbees-folder-6.15)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
jenkinsci/ssh-credentials-plugin,jenkinsci/ssh-credentials-plugin