news/inn{-current}: Update current and handle blocklistd rename

Update inn-current snapshot from 20260121 to 20260419. Rename the
BLACKLISTD option to BLOCKLISTD to match the upstream and FreeBSD 15+
rename. Add version-conditional logic to fall back to the old blacklist
API names on FreeBSD < 15.0 for the 2.8 branch.

Co-Authored-By: Jose Luis Duran <jlduran@FreeBSD.org>