[issue45042] Many multiprocessing tests are silently skipped since 3.9

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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pull_requests: +26598
pull_request: https://github.com/python/cpython/pull/28169

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45042>
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