Support newer version of Python

[melouaer]

Hello team

Cloudformation cli python plugin supports python3.6 and python3.7 runtime for building new types.
As of today, these python versions are at end of support.
Are there any plans to support a newer version of Python runtime in the roadmap?

Thank you

[kapilt]

yeah this causes a serious issue wrt to using dependencies as most of the ecosystem has moved on from these unsupported versions.

[kapilt]

it does look like newer versions are supported per the cli code just the documentation is woefully out of date.

https://github.com/aws-cloudformation/cloudformation-cli/blob/master/src/rpdk/core/hook/init_hook.py