Update dependency PyYAML to v5 [SECURITY] - abandoned

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
PyYAML (source)	==3.12 -> ==5.4

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GitHub Vulnerability Alerts

CVE-2020-14343

A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.

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Release Notes

yaml/pyyaml

v5.4

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v5.3.1

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v5.3

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v5.2

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• Repair incompatibilities introduced with 5.1. The default Loader was changed,
  but several methods like add_constructor still used the old defahttps://github.com/yaml/pyyaml/pull/279pull/279 -- A more flexible fix for custom tag consthttps://github.com/yaml/pyyaml/pull/287aml/pull/287 -- Change default loader for yaml.add_https://github.com/yaml/pyyaml/pull/305/pyyaml/pull/305 -- Change default loader for add_implicit_resolver, add_path_resolver
• Make FullLoader safer by removing python/object/apply from the default FullLoader
  https://github.com/yaml/pyyaml/pull/347/347 -- Move constructor for object/apply to UnsafeConstructor
• Fix bug introduced in 5.1 where quoting went wrong on systems with sys.maxunicode <= 0xffff
  https://github.com/yaml/pyyaml/pull/276/276 -- Fix logic for quoting special characters
• Other PRs:
  https://github.com/yaml/pyyaml/pull/280/280 -- Update CHANGES for 5.1

v5.1.2

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• Re-release of 5.1 with regenerated Cython sources to build properly for Python 3.8b2+

v5.1.1

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• Re-release of 5.1 with regenerated Cython sources to build properly for Python 3.8b1

v5.1

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• Re-release of 5.1 with regenerated Cython sources to build properly for Python 3.8b2+

v3.13

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• Resolved issues around PyYAML working in Python 3.7.

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