Security update for GraphicsMagick

This update for GraphicsMagick fixes the following issues:

- CVE-2020-12672: heap-based buffer overflow in ReadMNGImage in coders/png.c. (boo#1171271)

Fixed bugs
bnc#1171271
VUL-0: CVE-2020-12672: GraphicsMagick: heap-based buffer overflow in ReadMNGImage in coders/png.c.
Selected Binaries
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