Recommended update for gtk3

This update for gtk3 fixes the following issue:

- Ensure printer entries from Avahi are usable (bsc#1094486, bsc#1189238).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

Fixed bugs
bnc#1094486
auto-discovered printer is not usable from GTK3 applications
bnc#1189238
L3: duplicate printers showing in GNOME printer dialogs on SLED15 SP2
Selected Binaries
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