[issue38546] test_concurrent_futures: reap_children() warnings on RHEL7 and RHEL8 buildbots

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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pull_requests: +17122
pull_request: https://github.com/python/cpython/pull/17655

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<https://bugs.python.org/issue38546>
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