Readded Newtonsoft.Json dep

Author: gave92

src/Files.App/Files.App.csproj

@@ -107,6 +107,7 @@
         <PackageReference Include="Microsoft.Management.Infrastructure" />
         <PackageReference Include="Microsoft.Management.Infrastructure.Runtime.Win" />
         <PackageReference Include="Microsoft.Windows.CsWinRT" />
+		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     </ItemGroup>
 
     <ItemGroup>