Bump cloud_controller_ng

Dependency updates in cloud_controller_ng:

- build(deps-dev): bump parallel_tests from 5.6.0 to 5.7.0
    PR: cloudfoundry/cloud_controller_ng#5016
    Author: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: ari-wg-gitbot