Security update for stb

This update for stb fixes the following issues:

- CVE-2021-42716: fixed buffer overflow in stb_image PNM loader (boo#1191743)

Fixed bugs
bnc#1191743
VUL-1: CVE-2021-28021: Buffer overflow vulnerability in function stbi__extend_receive in stb_image.h in stb 2.26 via a crafted JPEG file.
Selected Binaries
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