Allow Octokit 8.0

[Daniel Alfaro]

Octokit v8.0.0 was released with changes to the way pull request comments are created. They have removed the deprecated position argument and replaced it with line

https://github.com/octokit/octokit.rb/releases/tag/v8.0.0
octokit/octokit.rb#1566

https://docs.github.com/en/rest/pulls/comments?apiVersion=2022-11-28#create-a-review-comment-for-a-pull-request