Tools: upgrade libpng to 1.6.55

TheMostDiligent · TheMostDiligent · commit ef14fcd27234 · 2026-03-02T21:37:16.000-08:00
diff --git a/DiligentTools b/DiligentTools
@@ -1 +1 @@
-Subproject commit c26cce90656c6b5860e5f98dd9cb374e813b3414
+Subproject commit 4de7a2bb594cf372cd3e085fbcb3680778e5a324
