[3.10] gh-91607: Fix several test_concurrent_futures tests to test what they claim#91612

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gpshead merged 1 commit intopython:3.10from

gpshead:backport-7fa3a5a-3.10

Apr 16, 2022

Commits on Apr 16, 2022

[3.10] gh-91607: Fix several test_concurrent_futures tests to actually test what they claim (GH-91600)
gpshead
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