SUSE-SU-2025:4533-1 Security update for libpng16

This update for libpng16 fixes the following issues: - CVE-2025-64720: Fixed buffer overflow in pngimagereadcomposite via incorrect palette premultiplication bsc1254159 - CVE-2025-64505: Fixed heap buffer over-read in pngdoquantize via malformed palette index bsc1254157 - CVE-2025-64506: Fixed he...