Update dependency YamlDotNet to v12.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
YamlDotNet (source)	nuget	minor	12.0.2 -> 12.1.0

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Release Notes

aaubry/YamlDotNet

### [`v12.1.0`](https://togithub.com/aaubry/YamlDotNet/releases/tag/v12.1.0): Release 12.1.0 - Merge pull request [#​728](https://togithub.com/aaubry/YamlDotNet/issues/728) from marshall777/patch-1\ Correction of LowerCaseNamingConvention documentation - Merge pull request [#​711](https://togithub.com/aaubry/YamlDotNet/issues/711) from adamralph/upgrade-bullseye\ upgrade Bullseye from 3.6.0 to 4.0.0 - Merge pull request [#​735](https://togithub.com/aaubry/YamlDotNet/issues/735) from adamralph/bullseye-public-only\ updated Bullseye from 4.0.0 to 4.2.0 - Merge pull request [#​747](https://togithub.com/aaubry/YamlDotNet/issues/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

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