mod: update gvisor to 20250816

Author: ignoramous

go.mod

@@ -23,8 +23,8 @@ require (
 	go4.org/unsafe/assume-no-moving-gc v0.0.0-20231121144256-b99613f794b6
 	golang.org/x/mobile v0.0.0-20250506005352-78cd7a343bde
 	golang.org/x/net v0.40.0
-	golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb
-	gvisor.dev/gvisor v0.0.0-20250729204252-ebe7818ac67b
+	golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173
+	gvisor.dev/gvisor v0.0.0-20250816195534-fc2f4df6597a
 	nhooyr.io/websocket v1.8.7
 )