Add NEWS entry

Author: johng

Misc/NEWS.d/next/Core_and_Builtins/2026-10-03-08-45-17.gh-issue-158639.yHi2F2.rst

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+Fix specialization of calls to C methods inherited from built-in types when
+the receiver is an instance of a subclass, such as
+:class:`~collections.defaultdict` or a :func:`~collections.namedtuple`. The
+specialized ``CALL_METHOD_DESCRIPTOR_*`` instructions previously failed their
+guard on every such call and fell back to the generic call path.