Update YamlDotNet to 8.1.2

Author: brendandburns

src/KubernetesClient/KubernetesClient.csproj

@@ -37,7 +37,7 @@
     <PackageReference Include="Microsoft.Rest.ClientRuntime" Version="2.3.10" />
     <PackageReference Include="Newtonsoft.Json" Version="9.0.1" Condition="'$(TargetFramework)' != 'netstandard2.0' and '$(TargetFramework)' != 'netcoreapp2.1'" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.2" Condition="'$(TargetFramework)' == 'netstandard2.0' or '$(TargetFramework)' == 'netcoreapp2.1'" />
-    <PackageReference Include="YamlDotNet" Version="6.0.0" />
+    <PackageReference Include="YamlDotNet" Version="8.1.2" />
     <PackageReference Include="System.Buffers" Version="4.5.1" Condition="'$(TargetFramework)' != 'netcoreapp2.1'" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
   </ItemGroup>