Update dependencies from https://github.com/dotnet/arcade build 20190501.6 (#9916)

- Microsoft.DotNet.GenAPI - 1.0.0-beta.19251.6
- Microsoft.DotNet.Helix.Sdk - 2.0.0-beta.19251.6

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -384,13 +384,13 @@
       <Uri>https://github.com/aspnet/Extensions</Uri>
       <Sha>d88243484c867b15864f2d5dc02669339692a3e2</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.GenAPI" Version="1.0.0-beta.19229.8">
+    <Dependency Name="Microsoft.DotNet.GenAPI" Version="1.0.0-beta.19251.6">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>a7a250e9c13147134543c35fef2fb81f19592edf</Sha>
+      <Sha>ea9b2530a1559dd6426730aba52fca1924db2b65</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.Helix.Sdk" Version="2.0.0-beta.19105.2">
+    <Dependency Name="Microsoft.DotNet.Helix.Sdk" Version="2.0.0-beta.19251.6">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>000</Sha>
+      <Sha>ea9b2530a1559dd6426730aba52fca1924db2b65</Sha>
     </Dependency>
     <Dependency Name="Microsoft.AspNetCore.Testing" Version="3.0.0-preview6.19251.12" CoherentParentDependency="Microsoft.EntityFrameworkCore">
       <Uri>https://github.com/aspnet/Extensions</Uri>

eng/Versions.props

@@ -17,7 +17,7 @@
   -->
   <PropertyGroup Label="Automated">
     <!-- Packages from dotnet/arcade -->
-    <MicrosoftDotNetGenAPIPackageVersion>1.0.0-beta.19229.8</MicrosoftDotNetGenAPIPackageVersion>
+    <MicrosoftDotNetGenAPIPackageVersion>1.0.0-beta.19251.6</MicrosoftDotNetGenAPIPackageVersion>
     <!-- Packages from dotnet/core-setup -->
     <MicrosoftExtensionsDependencyModelPackageVersion>3.0.0-preview6-27701-18</MicrosoftExtensionsDependencyModelPackageVersion>
     <MicrosoftNETCoreAppPackageVersion>3.0.0-preview6-27701-18</MicrosoftNETCoreAppPackageVersion>

global.json

@@ -4,6 +4,6 @@
   },
   "msbuild-sdks": {
     "Yarn.MSBuild": "1.13.0",
-    "Microsoft.DotNet.Helix.Sdk": "2.0.0-beta.19105.2"
+    "Microsoft.DotNet.Helix.Sdk": "2.0.0-beta.19251.6"
   }
 }