dig fails with "isc_nm_tcpdnsconnect: address in use" on OpenBSD
kasp and dnssec (sometimes autosign and zero) system tests started failing reliably on OpenBSD on main after ff2bc789 got merged. #1295042 is the first scheduled CI pipeline which fails with:
dig: isc_nm_tcpdnsconnect: address in useI was able to identify; latest is https://gitlab.isc.org/isc-projects/bind9/-/jobs/1358830.
No specific part of kasp and dnssec system tests seems to trigger this issue. Also this issue is present only when multiple test runs at the same time, tests don't fail when they run on their own.