Update dependencies from https://github.com/dotnet/standard build 20190417.2 (#36997)

- NETStandard.Library - 2.1.0-prerelease.19217.2

Author: dotnet-maestro[bot]

eng/Version.Details.xml

@@ -34,9 +34,9 @@
       <Uri>https://github.com/dotnet/arcade</Uri>
       <Sha>09e01af076175a6dbf19e442707722e751a7163b</Sha>
     </Dependency>
-    <Dependency Name="NETStandard.Library" Version="2.1.0-prerelease.19217.1">
+    <Dependency Name="NETStandard.Library" Version="2.1.0-prerelease.19217.2">
       <Uri>https://github.com/dotnet/standard</Uri>
-      <Sha>4ed1867803dd2fa96b671b45e1afd1c12d268627</Sha>
+      <Sha>25538d60f7f4c2c79cf098f2b808907d87b516a7</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.Helix.Sdk" Version="2.0.0-beta.19216.2">
       <Uri>https://github.com/dotnet/arcade</Uri>

eng/Versions.props

@@ -46,7 +46,7 @@
     <!-- Corefx dependencies -->
     <MicrosoftNETCorePlatformsPackageVersion>3.0.0-preview5.19217.6</MicrosoftNETCorePlatformsPackageVersion>
     <!-- Standard dependencies -->
-    <NETStandardLibraryPackageVersion>2.1.0-prerelease.19217.1</NETStandardLibraryPackageVersion>
+    <NETStandardLibraryPackageVersion>2.1.0-prerelease.19217.2</NETStandardLibraryPackageVersion>
     <!-- dotnet-optimization dependencies -->
     <optimizationwindows_ntx64IBCCoreFxPackageVersion>99.99.99-master-20190313.3</optimizationwindows_ntx64IBCCoreFxPackageVersion>
   </PropertyGroup>