Update Directory.Build.props

src/Components/Blazor/Directory.Build.props

@@ -1,10 +1 @@
-<Project>
-  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory)..\, Directory.Build.props))\Directory.Build.props" />
-  <Import Project="Blazor.Version.props" />
 
-  <PropertyGroup>
-    <!-- This property points to the latest released Microsoft.AspNetCore.App version it needs to be updated to
-         target the latest patch before a preview release. -->
-    <LatestAspNetCoreReferenceVersion>3.1.0</LatestAspNetCoreReferenceVersion>
-  </PropertyGroup>
-</Project>