Update dependency libpng to v1.6.58

Author: renovate[bot]

.github/dependencies.json

@@ -8,7 +8,7 @@
   "lcms2": "2.18",
   "libavif": "1.4.1",
   "libimagequant": "4.4.1",
-  "libpng": "1.6.56",
+  "libpng": "1.6.58",
   "libwebp": "1.6.0",
   "libxcb": "1.17.0",
   "openjpeg": "2.5.4",