Bump pyyaml from 5.3.1 to 5.4

[dependabot[bot]]

Bumps pyyaml from 5.3.1 to 5.4.

Changelog

Sourced from pyyaml's changelog.

5.4 (2021-01-19)

• yaml/pyyaml#407 -- Build modernization, remove distutils, fix metadata, build wheels, CI to GHA
• yaml/pyyaml#472 -- Fix for CVE-2020-14343, moves arbitrary python tags to UnsafeLoader
• yaml/pyyaml#441 -- Fix memory leak in implicit resolver setup
• yaml/pyyaml#392 -- Fix py2 copy support for timezone objects
• yaml/pyyaml#378 -- Fix compatibility with Jython

Commits

• 58d0cb7 5.4 release
• a60f7a1 Fix compatibility with Jython
• ee98abd Run CI on PR base branch changes
• ddf2033 constructor.timezone: _copy & deepcopy
• fc914d5 Avoid repeatedly appending to yaml_implicit_resolvers
• a001f27 Fix for CVE-2020-14343
• fe15062 Add 3.9 to appveyor file for completeness sake
• 1e1c7fb Add a newline character to end of pyproject.toml
• 0b6b7d6 Start sentences and phrases for capital letters
• c976915 Shell code improvements
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Merging #12 (a1f59c7) into master (80c0297) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #12   +/-   ##
=======================================
  Coverage   89.56%   89.56%           
=======================================
  Files           6        6           
  Lines         393      393           
=======================================
  Hits          352      352           
  Misses         41       41           

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