PEP 739: Mark as Final

[FFY00]

• [ ] Final implementation has been merged (including tests and docs)
• [ ] PEP matches the final implementation
• [ ] Any substantial changes since the accepted version approved by the SC/PEP delegate
• [ ] Pull request title in appropriate format (PEP 123: Mark as Final)
• [ ] Status changed to Final (and Python-Version is correct)
• [ ] Canonical docs/spec linked with a canonical-doc directive (or canonical-pypa-spec for packaging PEPs, or canonical-typing-spec for typing PEPs)

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📚 Documentation preview 📚: https://pep-previews--4629.org.readthedocs.build/

[FFY00]

Ah, right! Let's just wait a bit on the PR though :blush: