[GR-79862] Fix inherited native weak reference offset. - #1164
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GitHub Issue: #1157
A Python subclass (with slots) of a native weak-reference type could expose an incorrect native 'tp_weaklistoffset`, causing cyclic GC to interpret another field as a weakref list and hang.
This was because we didn't use the subclass’ precomputed hidden weakref offset when materializing its native type.