[issue31234] Make support.threading_cleanup() stricter

[STINNER Victor]

STINNER Victor added the comment:


New changeset da3e5cf961f9bcc4bb376386cfe7a2865325086c by Victor Stinner in branch 'master':
bpo-31234: Join timers in test_threading (#3598)
https://github.com/python/cpython/commit/da3e5cf961f9bcc4bb376386cfe7a2865325086c


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