Update Octokit to 8.0

What does this MR do and why?

Updates following gems:

gem	diffend
octokit	https://my.diffend.io/gems/octokit/6.0.0/8.0.0
licensee	https://my.diffend.io/gems/licensee/9.16.0/9.16.1
danger	https://my.diffend.io/gems/danger/9.3.1/9.4.2

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