Security update for spice-gtk

This update for spice-gtk fixes the following issues:

- CVE-2020-14355: Fixed multiple buffer overflow vulnerabilities in QUIC image decoding (bsc#1177158).

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

Fixed bugs
bnc#1177158
VUL-0: EMBARGOED: CVE-2020-14355: spice: multiple buffer overflow vulnerabilities in QUIC decoding code
Selected Binaries
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