[release/3.1] Update dependencies from dotnet/arcade (dotnet/aspnetcore-tooling#1257)

* Update dependencies from https://github.com/dotnet/arcade build 20191017.3

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19517.3

* Remove duplicate icon element
\n\nCommit migrated from ce261e9953

src/Razor/Microsoft.NET.Sdk.Razor/src/Microsoft.NET.Sdk.Razor.nuspec

@@ -2,7 +2,6 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
   <metadata>
     $CommonMetadataElements$
-    <icon>packageIcon.png</icon>
     <dependencies>
       <group targetFramework=".NETStandard2.0" />
     </dependencies>