Bump YamlDotNet from 8.1.2 to 12.2.1

[dependabot[bot]]

Bumps YamlDotNet from 8.1.2 to 12.2.1.

Release notes

Sourced from YamlDotNet's releases.

Release 12.2.1

• Merge pull request #750 from nuttytree/f/throw-exception-for-non-unique-keys
  Throw an exception on duplicate keys

Release 12.2.0

• Merge pull request #722 from EdwardCooke/ec-712-privateconstructor
  Allow parameterless private constructors when enabled

Release 12.1.0

• Merge pull request #728 from marshall777/patch-1
  Correction of LowerCaseNamingConvention documentation

• Merge pull request #711 from adamralph/upgrade-bullseye
  upgrade Bullseye from 3.6.0 to 4.0.0

• Merge pull request #735 from adamralph/bullseye-public-only
  updated Bullseye from 4.0.0 to 4.2.0

• Merge pull request #747 from polterguy/issue-746
  Allow setting the newline character when serializing

• Add required dot net core versions to the workflow

• Revert Bullseye to fix release issues
  It was incorrectly detecting AppVeyor as the host

Release 12.0.2

• Merge pull request #720 from Unity-Technologies/fix/line-endings
  Fix inconsistent line endings

• Merge pull request #721 from Unity-Technologies/fix/null-warnings
  Adjust null warning in ScalarNodeDeserializer

• Changed eol to EOL to attempt build fix

• Reordered gitattributes

• Remove Travis build information
  Since we no longer use it.

• Merge pull request #726 from EdwardCooke/ec-fixinggitattributes
  fixinggitattributes

• Merge pull request #727 from EdwardCooke/ec-finalizelineendingcleanup
  Finalize line endings in cs files to crlf

• Merge pull request #730 from lkillgore/master
  Fix Inf and NaN regex when using WithAttemptingUnquotedStringTypeDeserialization

Release 12.0.1

... (truncated)

Commits

• 6bf5b44 Merge pull request #750 from nuttytree/f/throw-exception-for-non-unique-keys
• fd2bd26 Make duplicate key checking optional
• 1e99937 Merge pull request #722 from EdwardCooke/ec-712-privateconstructor
• a4cc5bc Fixed duplicate reference warnings on build of netstandard
• a24e40e Fix a warning about missing xml comment on allowPrivateConstructors argument
• 932d9fe Merge branch 'master' of github.com:aaubry/YamlDotNet into ec-712-privatecons...
• 2eecdb1 Revert Bullseye to fix release issues
• afdd1e2 Fix IgnoreExtraPropertiesIfWantedNamingScheme test
• 25f8511 Throw an exception on duplicate keys
• 78b1ab3 Add required dot net core versions to the workflow
• Additional commits viewable in compare view

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Superseded by #193.