cpython/Misc/NEWS.d/next/Core_and_Builtins/2024-08-01-19-13-58.gh-issue-122527.eztso6.rst

Fix a crash that occurred when a ``PyStructSequence`` was deallocated after
its type's dictionary was cleared by the GC.  The type's
:c:member:`~PyTypeObject.tp_basicsize` now accounts for non-sequence fields
that aren't included in the :c:macro:`Py_SIZE` of the sequence.