In our project, we want to use apache-beam, but cannot due to having these dependencies:

google-cloud-pubsub==2.5.0

google-cloud-vision==2.0.0

Seems like the breaking change was due to "microgenerator"

https://github.com/googleapis/python-pubsub/releases

https://github.com/googleapis/python-vision/releases

(also dropping support for older versions of python)

What do we need to do to increase the version support defined here: 

Imported from Jira BEAM-12498. Original Jira may contain additional context.
Reported by: sangm.