CLSA-2026-1786552804 ImageMagick: Fix of 2 CVEs

CVE-2026-61868: relinquish scanline and destroy chromaimage on blob open failure in ReadYUVImage coders/yuv.c to fix a memory leak - CVE-2026-61869: destroy quantuminfo before throwing on pixel and colormap allocation failure in WriteMIFFImage coders/miff.c to fix a memory leak...