[issue24373] Use traverse & finalize in xxlimited and in PEP 489 tests

[Roundup Robot]

Roundup Robot added the comment:

New changeset 265eeb60443a by Nick Coghlan in branch '3.5':
Issue #24373: Eliminate PEP 489 test refleaks
https://hg.python.org/cpython/rev/265eeb60443a

New changeset f24cd8bc5250 by Nick Coghlan in branch 'default':
Merge fix for issue #24373 from 3.5
https://hg.python.org/cpython/rev/f24cd8bc5250

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nosy: +python-dev

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