[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset acb9fa79fa6453c2bbe3ccfc9cad2837feb90093 by Victor Stinner in branch 'master':
bpo-31234, socket.create_connection(): Fix ref cycle (#3546)
https://github.com/python/cpython/commit/acb9fa79fa6453c2bbe3ccfc9cad2837feb90093


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<https://bugs.python.org/issue31234>
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