www/newsboat: Update 2.42 => 2.43

Changelog:
https://github.com/newsboat/newsboat/blob/master/CHANGELOG.md#243---2026-03-22

PR: 295829
Reported by: Herbert J. Skuhra <herbert@gojira.at>
Approved by: Marko Turk <mt-bugs@markoturk.info> (maintainer)
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q2