Fix dependency update PR

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This should work around the issue that's preventing #1678 (an SDK dependency update PR) from building. I'm not sure why this wasn't necessary before. See why below.

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Here's the file that get's generated atartifiacts/obj/ef6/Debug/net40/ef6.AssemblyInfo.cs:

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.Reflection;

[assembly: System.Reflection.AssemblyCompanyAttribute("Microsoft Corporation")]
[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
[assembly: System.Reflection.AssemblyCopyrightAttribute("© Microsoft Corporation. All rights reserved.")]
[assembly: System.Reflection.AssemblyFileVersionAttribute("42.42.42.42424")]
[assembly: System.Reflection.AssemblyInformationalVersionAttribute("6.5.0-dev")]
[assembly: System.Reflection.AssemblyProductAttribute("Microsoft Entity Framework")]
[assembly: System.Reflection.AssemblyTitleAttribute("ef6")]
[assembly: System.Reflection.AssemblyVersionAttribute("42.42.42.42")]
[assembly: System.Reflection.AssemblyMetadataAttribute("RepositoryUrl", "")]
[assembly: System.Resources.NeutralResourcesLanguageAttribute("en-US")]

// Generated by the MSBuild WriteCodeFragment class.

I'm not sure why this wasn't necessary before.

Thinking about this more, I'm guessing that if this file was being generated for builds targeting net40 before, it probably wasn't referencing System.Reflection.AssemblyMetadataAttribute.

[halter73]

Found it: dotnet/sdk@d0b28b3

Filing an issue now.

[halter73]

dotnet/sdk#11862