Support new Custom Repository Rules API changes

[gmlewis]

GitHub Blog Changelog announcement: https://github.blog/changelog/2023-03-07-custom-repository-roles-api-ga-and-breaking-change/

This would be a great PR for any new contributor to this repo or a new Go developer.
All contributions are greatly appreciated!

Feel free to volunteer for any issue and the issue can be assigned to you so that others don't attempt to duplicate the work.

Please check out our CONTRIBUTING.md guide to get started. (In particular, please remember to go generate ./... and don't use force-push to your PRs.)

Thank you!

[exageraldo]

It seems that not much has changed.
I just submitted a PR with the changes.

[gmlewis]

Thank you, @exageraldo - please remove the "Draft" label from all your PRs when they are ready for review.

[exageraldo]

Done! ✅