Template staging broken on Beam 2.18.0

beam 2.18.0 can not stage cloud Dataflow templates

Looks like it is trying to access the RuntimeValueProvider during staging causing 'not accessible'

Repo with code to reproduce the issue: https://github.com/firemuzzy/dataflow-templates-bug

With the help of stack overflow narrowed the issue to the latest beam release and not python versions

https://stackoverflow.com/questions/59940069/how-do-you-create-a-google-cloud-dataflow-template-with-python-3?noredirect=1#59940069