Security update for python-PyYAML

This update for python-PyYAML fixes the following issues:

- CVE-2020-1747: Fixed an arbitrary code execution when YAML files are parsed by FullLoader (bsc#1165439).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Fixed bugs
bnc#1165439
VUL-0: CVE-2020-1747: python-PyYAML: PyYAML: arbitrary command execution through python/object/new when FullLoader is used
Selected Binaries
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