[master] Update dependencies from dotnet/roslyn aspnet/EntityFrameworkCore (#12353)
* Update dependencies from https://github.com/dotnet/roslyn build 20190719.1
- Microsoft.Net.Compilers.Toolset - 3.3.0-beta2-19369-01
* Update dependencies from https://github.com/aspnet/EntityFrameworkCore build 20190719.1
- Microsoft.EntityFrameworkCore.Tools - 3.0.0-preview8.19369.1
- Microsoft.EntityFrameworkCore.SqlServer - 3.0.0-preview8.19369.1
- dotnet-ef - 3.0.0-preview8.19369.1
- Microsoft.EntityFrameworkCore - 3.0.0-preview8.19369.1
- Microsoft.EntityFrameworkCore.InMemory - 3.0.0-preview8.19369.1
- Microsoft.EntityFrameworkCore.Relational - 3.0.0-preview8.19369.1
- Microsoft.EntityFrameworkCore.Sqlite - 3.0.0-preview8.19369.1
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