This UPM is simply a wrapper around the AssetStore package: https://assetstore.unity.com/packages/tools/integration/yamldotnet-for-unity-36292
Plese note that Everything inside /Plugins belongs to the author of that AssetStore package. Only the GUIDs were changed.
The package version corresponds to the AssetStore version. Credits to the creators of the asset.
Credits to the author of the original YamlDotNet library, aaubry: https://github.com/aaubry/YamlDotNet