update SDL3 from 3.2.20 to 3.4.2

libs/SDL3/test/testnative.c

@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -168,7 +168,7 @@ int main(int argc, char *argv[])
     SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
     SDL_RenderClear(renderer);
 
-    sprite = LoadTexture(renderer, "icon.bmp", true, NULL, NULL);
+    sprite = LoadTexture(renderer, "icon.png", true);
     if (!sprite) {
         quit(6);
     }