Update to 7.0.10-24

This Update fix a vulnerabiliy:
2020-06-14 7.0.10-20 <quetzlzacatenango@image...>
Fix out-of-bounds vulnerability when reading sixel images (reference https://github.com/ImageMagick/ImageMagick/issues/2143).

Full Changelog: https://imagemagick.org/script/changelog.php

PR: 246337
Reported by: VVD <vvd@unislabs.com>
Approved by: kwm (maintainer timeout)
MFH: 2020Q3
Sponsored by: Netzkommune GmbH