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[3.12] README: remove unmaintained sections (GH-107703) (#107762)

README: remove unmaintained sections (GH-107703)
(cherry picked from commit 7a250fdc16bb6f1fe0a6b0df8bb502870405b5d6)

Co-authored-by: Inada Naoki <songofacandy@gmail.com>
M
Miss Islington (bot) committed
2598a1a835e5bdf0532c08d867cf54f94aeb85a0
Parent: 8cb750d
Committed by GitHub <noreply@github.com> on 8/16/2023, 12:25:18 PM