net/fort: Update to 1.6.6

• Update to 1.6.6
• Changelog: https://github.com/NICMx/FORT-validator/releases/tag/1.6.6

Approved by: Toni Kalombo <toni@devboks.com> (maintainer, implicit)
MFH: 2025Q2

(cherry picked from commit 3ad45e78d7a6d254e35a3639cefa3fef65b0f21d)