SECURITY UPDATE: heap out-of-bounds read in the PSD/PSB decoder
debian/patches/CVE-2026-56367.patch: check image->rows *
psd_info->channels for integer overflow with
HeapOverflowSanityCheckGetSize() before ReadPSDRLEOffsets() allocates
the RLE offsets array in ReadPSDMergedImage() in coders/psd.c, and
raise MemoryAllocationFailed when that product wraps