Use octocrab fork, for logging response bodies

[davidpdrsn]

Checklist

• [x] I have read the Contributor Guide
• [x] I have read and agree to the Code of Conduct
• [x] I have added a description of my changes and why I'd like them included in the section below

Description of Changes

We're having issues with some PRs not getting merged. The error we're seeing in the logs is just

not able to automerge: Failed to merge PR: HTTP Error: error decoding response body: expected value at line 1 column 1

Thats not a lot to go by but it seems like it fails to decode the response it gets a merge API request that fails. I'd really like to see what the response actually is.

This PR moves us to a fork of octocrab I just made that logs response bodies before attempting to deserialize them. The commit is https://github.com/EmbarkStudios/octocrab/commit/9f3485382265b570116d07dee6ae95a50b6fe765

Hopefully that should give us some more insight into what's going on.

[davidpdrsn]

The issue seems to have been infra related. So this is no longer needed.