Use ghapi for local testing

[peaceiris]

Is your feature request related to a problem? Please describe

• fastai/ghapi: A delightful and complete interface to GitHub's amazing API
• Learn about ghapi, a new third-party Python client for the GitHub API - The GitHub Blog

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Additional context

[github-actions[bot]]

Related links:

- `0.944` [output final commit sha](https://github.com/peaceiris/actions-gh-pages/issues/348)
- `0.828` [Additional publish_dir:](https://github.com/peaceiris/actions-gh-pages/issues/370)
- `0.812` [Need to clarify docs about a hidden GitHub pages requirement on private repository](https://github.com/peaceiris/actions-gh-pages/issues/349)

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