www/waterfox: Update 6.6.0-beta-3 => 6.6.0-beta-5
Changelogs:
https://www.waterfox.net/docs/releases/6.6.0-beta-4/
https://www.waterfox.net/docs/releases/6.6.0-beta-5/
PR: 288769
MFH: 2025Q3
(cherry picked from commit abd83a6b1077effb99e289f0788c395067483f2a)