build(deps): bump pyyaml from 5.1.2 to 5.2 in /bot

[dependabot-preview]

Bumps pyyaml from 5.1.2 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

Commits

• a5c2a04 Version 5.2
• f4fd3fb Windows build tweaks
• f813bc0 Changes for 5.2b1
• 3f3c373 bump version to 5.2b1
• 8c5e47f Move constructor for object/apply to Unsafe
• 4a31b16 Change default loader for add_implicit_resolver, add_path_resolver
• a5394c0 Add custom constructors to multiple loaders
• 8d7a780 Change default loader for yaml.add_constructor (#287)
• 8a7d0ed Update CHANGES for 5.1 (#280)
• 31f2279 Fix logic for quoting special characters (#276)
• See full diff in compare view

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