[3.13] gh-130954: Fix multiprocessing test_notify_n (GH-130955) #130981
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The test could deadlock trying join on the worker processes.
Apply the same technique as gh-130933.
Join the process before the test ends in
test_notify
as well.(cherry picked from commit edd1eca)
Co-authored-by: Sam Gross [email protected]
test_multiprocessing_spawn.test_manager
:test_notify_n
deadlock #130954