devel/{kiwix-lib,libkiwix}: Update version 9.4.1=>12.0.0

• Rename port to match upstream renaming
• Pet portclippy
• Update is done without MAINTAINER approval as currently this is BROKEN on 14 and this version fixes the build on 14.

Changelog: https://github.com/kiwix/libkiwix/releases
PR: 271649
Approved by: portmgr (blanket)