Introduce get_python_state_dict() for Python 3.12 compatibility. #30007
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Description
PR pybind/pybind11#4570 cherry-pick. Merging here to unblock follow-on PRs (all currently lumped together under #30005).
Plan to keep pybind11 master & smart_holder in sync:
get_python_state_dict()
for Python 3.12 compatibility. pybind/pybind11#4570.Suggested changelog entry: