Update dependencies from https://github.com/dotnet/runtime-assets build 20200508...

Update dependencies from https://github.com/dotnet/runtime-assets build 20200508.1 (#36161)

- System.ComponentModel.TypeConverter.TestData: 5.0.0-beta.20257.1 -> 5.0.0-beta.20258.1
- System.Drawing.Common.TestData: 5.0.0-beta.20257.1 -> 5.0.0-beta.20258.1
- System.IO.Compression.TestData: 5.0.0-beta.20257.1 -> 5.0.0-beta.20258.1
- System.IO.Packaging.TestData: 5.0.0-beta.20257.1 -> 5.0.0-beta.20258.1
- System.Net.TestData: 5.0.0-beta.20257.1 -> 5.0.0-beta.20258.1
- System.Private.Runtime.UnicodeData: 5.0.0-beta.20257.1 -> 5.0.0-beta.20258.1
- System.Security.Cryptography.X509Certificates.TestData: 5.0.0-beta.20257.1 -> 5.0.0-beta.20258.1
- System.Windows.Extensions.TestData: 5.0.0-beta.20257.1 -> 5.0.0-beta.20258.1

Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>