Security update for snakeyaml

This update for snakeyaml fixes the following issues:

- Upgrade to 1.28
- CVE-2017-18640: The Alias feature allows entity expansion during a load operation (bsc#1159488, bsc#1186088)

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

Fixed bugs
bnc#1186088
Java:packages/snakeyaml: CVE-2017-18640
bnc#1159488
VUL-0: CVE-2017-18640: snakeyaml: The Alias feature allows entity expansion during a load operation
Selected Binaries
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