This update for sane-backends fixes the following issues:
sane-backends version upgrade to 1.0.31:
sane-backends version upgrade to 1.0.30
fixes memory corruption bugs CVE-2020-12861, CVE-2020-12862,
CVE-2020-12863, CVE-2020-12864, CVE-2020-12865,
CVE-2020-12866, CVE-2020-12867 (bsc#1172524)
sane-backends version upgrade to 1.0.31
to further improve hardware enablement for scanner devices
(jsc#SLE-15561 and jsc#SLE-15560 with jsc#ECO-2418)
The new escl backend cannot be provided for SLE12 because
it requires more additional software (avahi-client, libcurl,
and libpoppler-glib-devel) where in particular for libcurl
the one that is in SLE12 (via libcurl-devel-7.37.0) is likely
too old because with that building the escl backend fails with
'escl/escl.c:1267:34: error: 'CURLOPTUNIXSOCKETPATH'
undeclared curleasysetopt(handle, CURLOPTUNIXSOCKETPATH'