ports-mgmt/poudriere-dsh2dsh: Update 3.4.99.20250725 => 3.4.99.20250802

This update includes a fix from freebsd/poudriere#1228
https://github.com/freebsd/poudriere/pull/1228

download_from_repo: Only query and fetch from FreeBSD repo

Changelog:
https://github.com/dsh2dsh/poudriere/compare/3.4.99.20250725...3.4.99.20250802

PR: 288610
Approved by: yuri@ (Mentor)