gn: update to Git HEAD (2025-05-27)

gn/src/out/last_commit_position.h

@@ -3,7 +3,7 @@
 #ifndef OUT_LAST_COMMIT_POSITION_H_
 #define OUT_LAST_COMMIT_POSITION_H_
 
-#define LAST_COMMIT_POSITION_NUM 2234
-#define LAST_COMMIT_POSITION "2234 (487f8353f154)"
+#define LAST_COMMIT_POSITION_NUM 2238
+#define LAST_COMMIT_POSITION "2238 (a84e399f9999)"
 
 #endif  // OUT_LAST_COMMIT_POSITION_H_