[FEAT]: Add missing "Create a fork" parameters

[jamesc-skyward]

Describe the need

GitHub's documentation indicates it has name and default_branch_only parameters available when creating a new fork: https://docs.github.com/en/rest/repos/forks?apiVersion=2022-11-28#create-a-fork

These two parameters are missing from octokit.net.

SDK Version

No response

API Version

No response

Relevant log output

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