fix: commit signoff is enforced by the organization

[steveteuber]

Recreate the pull request #2222 to resolve issue #2077.

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Before the change?

• There is a bug in the GitHub API 2022-11-28 version that causes a 422 error when updating a repository within an organization that has "Require sign off on web-based commits" enabled.

After the change?

• On a repository update, we check if the organization has "Require sign off on web-based commits" enabled.
  If it's enabled, we do not send the web_commit_signoff_required field in the update request to avoid the 422 error.

Pull request checklist

• 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!

• No

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[steveteuber]

@nickfloyd can you review this pull request? This would be great 😉