Stackoverflow during YamlStream.Load()

[mschessler]

Describe the bug
While fuzzing another library an input was found that leads to an stack overflow in YamlStreams Load() funktion.
I would assume thats not wanted behaviour.
Stacktrace:

Stack overflow.
Repeat 19262 times:

at YamlDotNet.RepresentationModel.YamlAliasNode.Equals(System.Object)

at System.Collections.Generic.ObjectEqualityComparer1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Equals(System.__Canon, System.__Canon) at System.Collections.Generic.Dictionary2[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].FindValue(System.__Canon)
at System.Collections.Generic.Dictionary2[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Item(System.__Canon) at YamlDotNet.Helpers.OrderedDictionary2[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].get_Item(System.__Canon)
at YamlDotNet.RepresentationModel.YamlMappingNode.ResolveAliases(YamlDotNet.RepresentationModel.DocumentLoadingState)
at YamlDotNet.RepresentationModel.DocumentLoadingState.ResolveAliases()
at YamlDotNet.RepresentationModel.YamlDocument..ctor(YamlDotNet.Core.IParser)
at YamlDotNet.RepresentationModel.YamlStream.Load(YamlDotNet.Core.IParser)
at YamlDotNet.RepresentationModel.YamlStream.Load(System.IO.TextReader)
at FuzzTest.Program.Main(System.String[])

To Reproduce
var yamlText = "{ *a, &a }";
var yamlstream = new YamlStream();
var reader = new StringReader(yamlText);
yamlstream.Load(reader);

[mschessler]

Closing duplicate: #375