net-p2p/hostd: update to 2.5.1

This update is mandatory to continue participating in the network,
previous versions will cease to work in December 2025!

Changelog: https://github.com/SiaFoundation/hostd/releases/tag/v2.5.1

PR: 291057
MFH: 2025Q4
(cherry picked from commit 3b412029a4f6188e935b1fe30be66a321c118c45)