CLSA-2026-1777552532 Fix CVE(s): CVE-2025-64720, CVE-2025-65018

No-source-change rebuild against libpng = 1.6.37-2+tuxcare.els2 to pick up the libpng security fixes for: - CVE-2025-64720: pngimagereadcomposite OOB read on palette images with PNGFLAGOPTIMIZEALPHA libpng 1.6.51. - CVE-2025-65018: pngimagefinishread heap buffer overflow on 16-bit interlaced PNGs...