[release/5.0-preview8] Update dependencies from dotnet/arcade (#23979)
* Update dependencies from https://github.com/dotnet/arcade build 20200714.3
Microsoft.DotNet.GenAPI , Microsoft.DotNet.Helix.Sdk , Microsoft.DotNet.Arcade.Sdk
From Version 5.0.0-beta.20330.3 -> To Version 5.0.0-beta.20364.3
* Update DotNetMuxerTests.cs
- skip failing test
Co-authored-by: dotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>
Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com>
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