test: skip an ipv6 test on IBM i

Due to some unknown system configuration, the code
`socket_ipv6.bind(0, 111::1)` does not throw the
expected error EADDRNOTAVAIL on some IBM i systems.
This issue is still being investigated. To get the
IBM i CI passing, skip it for now.

PR-URL: https://github.com/nodejs/node/pull/34209


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>