validates runner spark failing

Guessing this was due to recent changes such as for the gradle upgrade (BEAM-13430).

https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark

07:01:26 * What went wrong:
07:01:26 Could not determine the dependencies of task ':runners:spark:2:validatesRunnerBatch'.
07:01:26 > Could not resolve all task dependencies for configuration ':runners:spark:2:validatesRunner'.
07:01:26 > Could not resolve project :runners:spark:2.
07:01:26 Required by:
07:01:26 project :runners:spark:2
07:01:26 > Selected configuration 'compileClasspath' on 'project :runners:spark:2' but it can't be used as a project dependency because it isn't intended for consumption by other components.