Update dependency Microsoft.NET.Test.Sdk to v16.6.1 (#581)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

System.IO.Abstractions.TestingHelpers.Tests/System.IO.Abstractions.TestingHelpers.Tests.csproj

@@ -21,7 +21,7 @@
     <ProjectReference Include="../System.IO.Abstractions.TestingHelpers/System.IO.Abstractions.TestingHelpers.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.6.1" />
     <PackageReference Include="Moq" Version="4.14.1" />
     <PackageReference Include="nunit" Version="3.12.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.16.1" />