[release/6.0] Update dependencies from dotnet/emsdk dotnet/runtime-assets (#57925)

[release/6.0] Update dependencies from dotnet/emsdk dotnet/runtime-assets (#57925)

* Update dependencies from https://github.com/dotnet/emsdk build 20210823.1

Microsoft.NET.Workload.Emscripten.Manifest-6.0.100
 From Version 6.0.0-rc.1.21419.1 -> To Version 6.0.0-rc.2.21423.1

* Update dependencies from https://github.com/dotnet/runtime-assets build 20210823.1

Microsoft.DotNet.CilStrip.Sources , System.ComponentModel.TypeConverter.TestData , System.Drawing.Common.TestData , System.IO.Compression.TestData , System.IO.Packaging.TestData , System.Net.TestData , System.Private.Runtime.UnicodeData , System.Runtime.Numerics.TestData , System.Runtime.TimeZoneData , System.Security.Cryptography.X509Certificates.TestData , System.Windows.Extensions.TestData
 From Version 6.0.0-beta.21416.1 -> To Version 6.0.0-beta.21423.1

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