games/veloren-weekly: downgrade to s20260225 to unbreak fetch
> Fetched file size mismatch (expected 352338185, actual 9744384)
Reported by: pkg-fallout
This reverts commit 252f31c449118def9dc77e1cb58ff147e1f47482.
(cherry picked from commit 7aa84847d34f1387448af1d1d013957e09467121)