games/linux-steam-utils: Update 20260711 => 20260731
This is an in-between release upgrade that fixes the client being stuck
in an infinite loop.
PR: 297340
Sponsored by: UNIS Labs
MFH: 2026Q3
(cherry picked from commit 4af71030cbb62b8b56e4b1aee1b3d73a0104c1fe)