[v9_18] Add OpenBSD 7.1
Validation pipeline: https://gitlab.isc.org/isc-projects/bind9/-/pipelines/112550.
Backport of !6663 (merged)
Edited by Michał Kępień
Validation pipeline: https://gitlab.isc.org/isc-projects/bind9/-/pipelines/112550.
Backport of !6663 (merged)