[main] Update dependencies from dotnet/runtime dotnet/emsdk (#57491)

[main] Update dependencies from dotnet/runtime dotnet/emsdk (#57491)

* Update dependencies from https://github.com/dotnet/runtime build 20210815.6

Microsoft.NETCore.ILAsm , Microsoft.NETCore.DotNetHostPolicy , Microsoft.NETCore.DotNetHost , runtime.native.System.IO.Ports , Microsoft.NET.Sdk.IL , System.Runtime.CompilerServices.Unsafe , System.Text.Json
 From Version 6.0.0-rc.1.21411.3 -> To Version 6.0.0-rc.1.21415.6

* Update dependencies from https://github.com/dotnet/emsdk build 20210816.1

Microsoft.NET.Workload.Emscripten.Manifest-6.0.100
 From Version 6.0.0-rc.1.21415.1 -> To Version 6.0.0-rc.1.21416.1

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