Update dependency PyYAML to v5 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
PyYAML (source)	==3.11 -> ==5.4

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.

CVE-2017-18342

In PyYAML before 4.1, the yaml.load() API could execute arbitrary code. In other words, yaml.safe_load is not used.

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Release Notes

yaml/pyyaml (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 defauhttps://github.com/yaml/pyyaml/pull/279l/279 -- A more flexible fix for custom tag construchttps://github.com/yaml/pyyaml/pull/287ull/287 -- Change default loader for yaml.add_conshttps://github.com/yaml/pyyaml/pull/305l/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/34747 -- 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/27676 -- Fix logic for quoting special characters
• Other PRs:
  https://github.com/yaml/pyyaml/pull/28080 -- 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.

v3.12

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• https://github.com/yaml/pyyaml/pull/35 -- Some modernization of the test running
• https://github.com/yaml/pyyaml/pull/42 -- Install tox in a virtualenv
• https://github.com/yaml/pyyaml/pull/45 -- Allow colon in a plain scalar in a flow context
• https://github.com/yaml/pyyaml/pull/48 -- Fix typos
• https://github.com/yaml/pyyaml/pull/55 -- Improve RepresenterError creation
• https://github.com/yaml/pyyaml/pull/59 -- Resolves #​57, update readme issues link
• https://github.com/yaml/pyyaml/pull/60 -- Document and test Python 3.6 support
• https://github.com/yaml/pyyaml/pull/61 -- Use Travis CI built in pip cache support
• https://github.com/yaml/pyyaml/pull/62 -- Remove tox workaround for Travis CI
• https://github.com/yaml/pyyaml/pull/63 -- Adding support to Unicode characters over codepoint 0xffff
• https://github.com/yaml/pyyaml/pull/75 -- add 3.12 changelog
• https://github.com/yaml/pyyaml/pull/76 -- Fallback to Pure Python if Compilation fails
• https://github.com/yaml/pyyaml/pull/84 -- Drop unsupported Python 3.3
• https://github.com/yaml/pyyaml/pull/102 -- Include license file in the generated wheel package
• https://github.com/yaml/pyyaml/pull/105 -- Removed Python 2.6 & 3.3 support
• https://github.com/yaml/pyyaml/pull/111 -- Remove commented out Psyco code
• https://github.com/yaml/pyyaml/pull/129 -- Remove call to ord in lib3 emitter code
• https://github.com/yaml/pyyaml/pull/149 -- Test on Python 3.7-dev
• https://github.com/yaml/pyyaml/pull/158 -- Support escaped slash in double quotes "/"
• https://github.com/yaml/pyyaml/pull/175 -- Updated link to pypi in release announcement
• https://github.com/yaml/pyyaml/pull/181 -- Import Hashable from collections.abc
• https://github.com/yaml/pyyaml/pull/194 -- Reverting https://github.com/yaml/pyyaml/pull/74
• https://github.com/yaml/pyyaml/pull/195 -- Build libyaml on travis
• https://github.com/yaml/pyyaml/pull/196 -- Force cython when building sdist
• https://github.com/yaml/pyyaml/pull/254 -- Allow to turn off sorting keys in Dumper (2)
• https://github.com/yaml/pyyaml/pull/256 -- Make default_flow_style=False
• https://github.com/yaml/pyyaml/pull/257 -- Deprecate yaml.load and add FullLoader and UnsafeLoader classes
• https://github.com/yaml/pyyaml/pull/261 -- Skip certain unicode tests when maxunicode not > 0xffff
• https://github.com/yaml/pyyaml/pull/263 -- Windows Appveyor build

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