[release/3.1] Correct SHA to align w/ 3.1.6 core-setup release commit (#3425)

Author: dougbu

eng/Version.Details.xml

@@ -15,8 +15,8 @@
       <Sha>059a4a19e602494bfbed473dbbb18f2dbfbd0878</Sha>
     </Dependency>
     <Dependency Name="Microsoft.DotNet.PlatformAbstractions" Version="3.1.6">
-      <Uri>https://github.com/dotnet/core-setup</Uri>
-      <Sha>d7dd3dd2bad597a566915d6c8065fdffefef4be7</Sha>
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-core-setup</Uri>
+      <Sha>3acd9b0cd16596bad450c82be08780875a73c05c</Sha>
     </Dependency>
     <Dependency Name="Microsoft.Win32.Registry" Version="4.7.0" Pinned="true">
       <Uri>https://github.com/dotnet/corefx</Uri>

eng/Versions.props

@@ -84,14 +84,12 @@
     <!-- Packages from dotnet/roslyn -->
     <MicrosoftNetCompilersToolsetVersion>3.4.1-beta4-20127-10</MicrosoftNetCompilersToolsetVersion>
   </PropertyGroup>
-
   <!-- For the targeting pack, always use packages with PatchVersion=0 -->
   <PropertyGroup Condition=" '$(MSBuildProjectName)' == 'Microsoft.Internal.Extensions.Refs' OR '$(IsReferenceAssemblyProject)' == 'true' ">
     <SystemDiagnosticsEventLogPackageVersion>$(SystemDiagnosticsEventLogPackageVersion.Split('.')[0]).$(SystemDiagnosticsEventLogPackageVersion.Split('.')[1]).0</SystemDiagnosticsEventLogPackageVersion>
     <SystemIOPipelinesPackageVersion>$(SystemIOPipelinesPackageVersion.Split('.')[0]).$(SystemIOPipelinesPackageVersion.Split('.')[1]).0</SystemIOPipelinesPackageVersion>
     <SystemSecurityCryptographyXmlPackageVersion>$(SystemSecurityCryptographyXmlPackageVersion.Split('.')[0]).$(SystemSecurityCryptographyXmlPackageVersion.Split('.')[1]).0</SystemSecurityCryptographyXmlPackageVersion>
   </PropertyGroup>
-
   <PropertyGroup Label="Dependency version settings">
     <!--
       Win-x64 is used here because we have picked an arbitrary runtime identifier to flow the version of the latest NETCore.App runtime.