commented out not needed references

tests/ImageSharp.Sandbox46/ImageSharp.Sandbox46.csproj

@@ -22,8 +22,8 @@
     <PackageReference Include="Magick.NET-Q16-AnyCPU" Version="7.5.0" />
     <PackageReference Include="xunit" Version="2.3.1" />
     <PackageReference Include="Moq" Version="4.8.3" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.7.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
+    <!--<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />-->
+    <!--<PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />-->
   </ItemGroup>
   <ItemGroup>
     <Compile Include="..\ImageSharp.Tests\**\*.cs" Exclude="bin\**;obj\**" Link="Tests\%(RecursiveDir)%(Filename)%(Extension)" />