Support Sha autofix

[ghuntley]

Looking at https://github.com/autofix-dev/autofix, I don't think it supports auto-updating SHA values yet.

@ghuntley if that's something you'd like to add, please open an issue and we can address it later.

Originally posted by @mikenikles in https://github.com/gitpod-io/website/pull/1048#pullrequestreview-778699548