[3.11] gh-109832: concurrent.futures test_deadlock restores sys.stderr (GH-109887) #109893
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test_error_at_task_unpickle() and
test_error_during_result_unpickle_in_result_handler() now restore
sys.stderr which is overriden by _raise_error_ignore_stderr().
(cherry picked from commit 2897142)
Co-authored-by: Victor Stinner [email protected]