[3.12] gh-126451: Revert backports of ABC registrations for contextvars.Context and multiprocessing proxies #126735
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…ctions.abc.Mapping (pythonGH-126452) (python#126519)" This reverts commit d71da0f.
…to an appropriate collections.abc class (python#126419) (python#126436)" This reverts commit 47d48b6.
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These registrations were added in #126452 and #126419. They were backported to 3.12 in #126519 and #126436. Following discussion in #126451, we're keeping the new registrations in Python 3.14+ but reverting the backports to 3.13 and 3.12.
Revert "[3.12] gh-126451: Register contextvars.Context to collections.abc.Mapping (GH-126452) (#126519)"
Revert "[3.12] gh-126417: Register multiprocessing proxy types to an appropriate collections.abc class (#126419) (#126436)"