Fix Sandbox46

tests/ImageSharp.Sandbox46/ImageSharp.Sandbox46.csproj

@@ -19,6 +19,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="BitMiracle.LibJpeg.NET" Version="1.4.280" />
+    <PackageReference Include="Magick.NET-Q16-AnyCPU" Version="7.5.0" />
     <PackageReference Include="xunit" Version="2.3.1" />
     <PackageReference Include="Moq" Version="4.8.2" />
     <!--<PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />-->