Bump pyyaml from 5.4.1 to 6.0

[dependabot[bot]]

Bumps pyyaml from 5.4.1 to 6.0.

Changelog

Sourced from pyyaml's changelog.

6.0 (2021-10-13)

• yaml/pyyaml#327 -- Change README format to Markdown
• yaml/pyyaml#483 -- Add a test for YAML 1.1 types
• yaml/pyyaml#497 -- fix float resolver to ignore . and ._
• yaml/pyyaml#550 -- drop Python 2.7
• yaml/pyyaml#553 -- Fix spelling of “hexadecimal”
• yaml/pyyaml#556 -- fix representation of Enum subclasses
• yaml/pyyaml#557 -- fix libyaml extension compiler warnings
• yaml/pyyaml#560 -- fix ResourceWarning on leaked file descriptors
• yaml/pyyaml#561 -- always require Loader arg to yaml.load()
• yaml/pyyaml#564 -- remove remaining direct distutils usage

Commits

• 8cdff2c 6.0 release
• a4fb55e Update Python 3.10 versions for Windows build
• e45b964 Add Python 3.10 to tox.ini
• 4808fba 6.0b1 release
• d5aba40 Omnibus CI/artifact build update
• a6d384c Various setup fixes
• 8f3f979 No longer using appveyor
• c274365 The yaml.load{,_all} functions require Loader= now
• 2f87ac4 Add a basic test file for yaml.load and yaml.dump
• 7bd92df Makefile tweaks
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like pyyaml is no longer updatable, so this is no longer needed.