[3.11] gh-109401: Fix threading barrier test_default_timeout() (GH-109875) (#109877)

gh-109401: Fix threading barrier test_default_timeout() (GH-109875)

Increase timeouts. Barrier default timeout should be long enough to
spawn 4 threads on a slow CI.
(cherry picked from commit e5186c3de4194de3ea8c80edb182d786f5e20944)

Co-authored-by: Victor Stinner <vstinner@python.org>