Support for fine grained personal access tokens

Hey! First off thanks for this incredible project!

**Is your feature request related to a problem? Please describe.**

For security purposes it would be very helpful to be able to use GitHub's new fine grained access tokens but this does not work as the GraphQL API does not support them yet.

**Describe the solution you'd like**

How deeply integrated is usage of the GraphQL API? Would it be possible / feasible to use the REST API instead?

I'd be happy to work on a PR for this myself if it's deemed viable.

**Describe alternatives you've considered**

Waiting for GitHub to add support in the GraphQL API itself.

**Additional context**

It does seem like fine grained token support is [planned for Q1 2023](https://github.com/github/roadmap/issues/622) so hopefully this will be a non-issue soon but it would be great to have this work in the meantime.