As far as I can tell, you use @octokit/action only because of the need to be able to set a proxy - or is there another reason?
If not wouldn't @actions/github be enough? Because they already set a proxy according to their description.
I could open a pull request but I don't have a way of testing it …

If it works it could reduce the amount of dependencies a lot – from 5 to only 2 (and they are the official @action/* deps)