This update for sane-backends fixes the following issues:

sane-backends was updated to 1.0.31 to further improve hardware enablement for scanner devices (jsc#ECO-2418 jsc#SLE-15561 jsc#SLE-15560)
and also fix various security issues:

- CVE-2020-12861,CVE-2020-12865: Fixed an out of bounds write (bsc#1172524)
- CVE-2020-12862,CVE-2020-12863,CVE-2020-12864,: Fixed an out of bounds read (bsc#1172524)
- CVE-2020-12866,CVE-2020-12867: Fixed a null pointer dereference (bsc#1172524)

The upstream changelogs can be found here:

- https://gitlab.com/sane-project/backends/-/releases/1.0.28
- https://gitlab.com/sane-project/backends/-/releases/1.0.29
- https://gitlab.com/sane-project/backends/-/releases/1.0.30
- https://gitlab.com/sane-project/backends/-/releases/1.0.31