[3.13] gh-126451: Revert backports of ABC registrations for contextvars.Context and multiprocessing proxies
#126734
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…ctions.abc.Mapping (pythonGH-126452) (python#126518)" This reverts commit 59316a6.
…to an appropriate collections.abc class (python#126419) (python#126435)" This reverts commit c1e708a.
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These registrations were added in #126452 and #126419. They were backported to 3.13 in #126518 and #126435. 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 "[3.13] gh-126451: Register contextvars.Context to collections.abc.Mapping (GH-126452) (#126518)"
Revert "[3.13] gh-126417: Register multiprocessing proxy types to an appropriate collections.abc class (#126419) (#126435)"