[3.11] gh-95243: Mitigate the race condition in testSockName (GH-96173) #96256
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find_unused_port() has an inherent race condition, but we can't use
bind_port() as that uses .getsockname() which this test is exercising.
Try binding to unused ports a few times before failing.
Signed-off-by: Ross Burton [email protected]
(cherry picked from commit df11012)
Co-authored-by: Ross Burton [email protected]