test-cluster-net-listen-ipv6only-none was using port `0` for an
IPv6-only operation and assuming that the operating system would supply
a port that was also available in IPv4. However, CI results seem to
indicate that a port can be supplied that is in use by IPv4 but
available to IPv6, resulting in the test failing. Use `common.PORT` to
avoid this issue.
Fixes: https://github.com/nodejs/node/issues/29679
PR-URL: https://github.com/nodejs/node/pull/29681
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
