fix: garbage collection issues for #[pyclass(dict)]#6206
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PR contains two fixes for GC of
#[pyclass(dict)]#[pyclass(dict)]without a user defined__traverse__function did not define a required GC slots on the PyTypeObject to become discoverable to the cyclic garbage collector.Solution: now defined regardless in
create_type_object.Early returns (when there are live references we can early return i.e. tell cyclic GC we can't clear) in
_call_traversedid not drop lock / disarm trap which would cause a crash.Solution: Logic is now nested into inner function that can safely early return.
Related to issue #5953 / PR #6198 (no overlap with PR)