[3.11] gh-75743: Restore test_timeout.testConnectTimeout() (GH-109087) (#109102)

gh-75743: Restore test_timeout.testConnectTimeout() (GH-109087)

This un-skips this test now that pythontest.net implements appropriate firewall
rules for it.
(cherry picked from commit 1829a3c9a3712b6a68a3a449e4a08787c73da51d)

Co-authored-by: Ee Durbin <ewdurbin@gmail.com>