test_ssl test_get_server_certificate_timeout is flaky on macOS

tiran

Bug report

test_get_server_certificate_timeout is flaky and sometimes fails on macOS. The issue was previously reported in #88109 and #88403.

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FAIL: test_get_server_certificate_timeout (test.test_ssl.SimpleBackgroundTests.test_get_server_certificate_timeout)
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Traceback (most recent call last):
  File "/Users/runner/work/cpython/cpython/Lib/test/test_ssl.py", line 1981, in test_get_server_certificate_timeout
    with self.assertRaises(socket.timeout):
AssertionError: TimeoutError not raised