tests.sync.test_client.ProxyClientTests.test_secure_socks_proxy is flaky (timeout)

[aaugustin]

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ERROR: test_secure_socks_proxy (tests.sync.test_client.ProxyClientTests.test_secure_socks_proxy)
Client connects to server securely through a SOCKS5 proxy.
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Traceback (most recent call last):
  File "/home/runner/work/websockets/websockets/tests/sync/test_client.py", line 335, in test_secure_socks_proxy
    with connect(get_uri(server), ssl=CLIENT_CONTEXT) as client:
         ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/websockets/websockets/.tox/py/lib/python3.13/site-packages/websockets/sync/client.py", line 381, in connect
    connection.handshake(
    ~~~~~~~~~~~~~~~~~~~~^
        additional_headers,
        ^^^^^^^^^^^^^^^^^^^
        user_agent_header,
        ^^^^^^^^^^^^^^^^^^
        deadline.timeout(),
        ^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/home/runner/work/websockets/websockets/.tox/py/lib/python3.13/site-packages/websockets/sync/client.py", line 92, in handshake
    raise TimeoutError("timed out during handshake")
TimeoutError: timed out during handshake

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[aaugustin]

Seen here https://github.com/python-websockets/websockets/actions/runs/12977924574/job/36191936724