[master] Update dependencies from dotnet/corefx (dotnet/coreclr#27661)

* Update dependencies from https://github.com/dotnet/corefx build 20191103.8

- Microsoft.NETCore.Platforms - 5.0.0-alpha.1.19553.8
- Microsoft.Private.CoreFx.NETCoreApp - 5.0.0-alpha.1.19553.8

* Disable Quic tests


Commit migrated from dotnet/coreclr@2ad7893

src/coreclr/tests/CoreFX/CoreFX.issues.rsp

@@ -38,6 +38,9 @@
 -noclass System.Tests.Utf8StringTests
 -noclass System.Text.Tests.Utf8SpanTests
 
+# Missing OOB dependencies
+-nonamespace System.Net.Quic.Tests
+
 # System.Net.Tests are known for their instability
 -nonamespace System.Net.Http.Functional.Tests
 -nonamespace System.Net.Sockets.Tests