PEP 712: Mark as Rejected

[warsaw]

• [x] SC/PEP Delegate has formally accepted/rejected the PEP and posted to the Discussions-To thread
• [x] Pull request title in appropriate format (PEP 123: Mark as Accepted)
• [x] Status changed to Accepted/Rejected
• [x] Resolution link points directly to SC/PEP Delegate official acceptance/rejected post
• [x] Acceptance/rejection notice added, if the SC/PEP delegate had major conditions or comments
• [x] Discussions-To, Post-History and Python-Version up to date

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📚 Documentation preview 📚: https://pep-previews--3829.org.readthedocs.build/

[warsaw]

@ericvsmith as PEP Sponsor, please review and merge.