Upgrade libpng to 1.6.57 for CVE-2026-34757#16596

jslobodzian merged 1 commit intofasttrack/3.0microsoft/azurelinux:fasttrack/3.0from

cblmargh/libpng-upgrade-to-1.6.57-fasttrack/3.0microsoft/azurelinux:cblmargh/libpng-upgrade-to-1.6.57-fasttrack/3.0Copy head branch name to clipboard