feat: Update go-github to v81

[stevehipwell]

Closes #2891

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Before the change?

• go-github was at v67
• Org rulesets couldn't clear bypass actors

After the change?

• go-github is at v81
• Org ruleset bypass actors can be cleared

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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