Bump pyyaml from 4.2b1 to 5.2

[dependabot-preview]

Bumps pyyaml from 4.2b1 to 5.2.

Changelog

Sourced from pyyaml's changelog.

5.2 (2019-12-02)

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

5.1.2 (2019-07-30)

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

5.1.1 (2019-06-05)

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

5.1 (2019-03-13)

• yaml/pyyaml#35 -- Some modernization of the test running
• yaml/pyyaml#42 -- Install tox in a virtualenv
• yaml/pyyaml#45 -- Allow colon in a plain scalar in a flow context
• yaml/pyyaml#48 -- Fix typos
• yaml/pyyaml#55 -- Improve RepresenterError creation
• yaml/pyyaml#59 -- Resolves #57, update readme issues link
• yaml/pyyaml#60 -- Document and test Python 3.6 support
• yaml/pyyaml#61 -- Use Travis CI built in pip cache support
• yaml/pyyaml#62 -- Remove tox workaround for Travis CI
• yaml/pyyaml#63 -- Adding support to Unicode characters over codepoint 0xffff
• yaml/pyyaml#75 -- add 3.12 changelog
• yaml/pyyaml#76 -- Fallback to Pure Python if Compilation fails
• yaml/pyyaml#84 -- Drop unsupported Python 3.3
• yaml/pyyaml#102 -- Include license file in the generated wheel package
• yaml/pyyaml#105 -- Removed Python 2.6 & 3.3 support
• yaml/pyyaml#111 -- Remove commented out Psyco code
• yaml/pyyaml#129 -- Remove call to ord in lib3 emitter code
• yaml/pyyaml#149 -- Test on Python 3.7-dev
• yaml/pyyaml#158 -- Support escaped slash in double quotes "/"
• yaml/pyyaml#175 -- Updated link to pypi in release announcement
• yaml/pyyaml#181 -- Import Hashable from collections.abc
• yaml/pyyaml#194 -- Reverting yaml/pyyaml#74

... (truncated)

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[graingert]

#6623

[dependabot-preview]

Superseded by #7107.