upgrade vendored libpng to 1.6.48

sezero · sezero · commit b9cf035afdc5 · 2025-05-13T23:10:10.000+03:00
diff --git a/.gitmodules b/.gitmodules
@@ -5,7 +5,7 @@
 [submodule "external/libpng"]
 	path = external/libpng
 	url = https://github.com/libsdl-org/libpng.git
-	branch = v1.6.47-SDL
+	branch = v1.6.48-SDL
 [submodule "external/libwebp"]
 	path = external/libwebp
 	url = https://github.com/libsdl-org/libwebp.git
diff --git a/external/libpng b/external/libpng
@@ -1 +1 @@
-Subproject commit d5f3b730390cbbf9f1086a4aa97b7d44e42919ae
+Subproject commit 25d73b565d9903eaeb62ebebccf9d0533205e416
