Update libraries.md to include python client for GitHub's REST API that uses the OpenAPI Spec

[hamelsmu]

Why:

Including a new python client that is using GitHub's newly published open api spec!

What's being changed:

Adding a new python client to the docs

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging. (look for the deploy-to-heroku link in your pull request, then click View deployment)
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

cc: @jph00

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[janiceilene]

Thanks @hamelsmu! I'll get this triaged for review ⚡

[Pakphum100]

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[skedwards88]

Thanks for adding this @hamelsmu ! I'll get it merged.

[github-actions]

Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours.