[3.12] gh-88118: Fix some test_multiprocessing flakiness. (GH-116434)#116440
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Fix some test_multiprocessing flakiness.
Potentially introduced by #25845
not joining that thread likely leads to recently observed "environment
changed" logically passing but overall failing tests seen on some
buildbots similar to:
(cherry picked from commit ea1803e)
Co-authored-by: Gregory P. Smith [email protected]