Update dependencies from https://github.com/dotnet/arcade build 20190418.1 (#9496)

- Microsoft.DotNet.GenAPI - 1.0.0-beta.19218.1

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -380,9 +380,9 @@
       <Uri>https://github.com/aspnet/Extensions</Uri>
       <Sha>a0cf8f65d8d7c9b7b2e72ca53d0febf6290f29ce</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.GenAPI" Version="1.0.0-beta.19217.1">
+    <Dependency Name="Microsoft.DotNet.GenAPI" Version="1.0.0-beta.19218.1">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>4e21d52dabbb9f5705a90f097acb1465a0354c0d</Sha>
+      <Sha>46718d98c0fd03690a6a8c83da692a4a85a17902</Sha>
     </Dependency>
     <Dependency Name="Microsoft.AspNetCore.Testing" Version="3.0.0-preview5.19217.2" 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.19217.1</MicrosoftDotNetGenAPIPackageVersion>
+    <MicrosoftDotNetGenAPIPackageVersion>1.0.0-beta.19218.1</MicrosoftDotNetGenAPIPackageVersion>
     <!-- Packages from dotnet/core-setup -->
     <MicrosoftExtensionsDependencyModelPackageVersion>3.0.0-preview5-27617-01</MicrosoftExtensionsDependencyModelPackageVersion>
     <MicrosoftNETCoreAppPackageVersion>3.0.0-preview5-27617-01</MicrosoftNETCoreAppPackageVersion>