Update Directory.Build.Mgmt.props (Azure#22313)

Using the same build tool version for mgmt track 1 build prop

Author: allenjzhang

eng/mgmt/Directory.Build.Mgmt.props

@@ -8,7 +8,7 @@
   <!-- during execution of tasks tests, this conditional import will satisfy the import resolution. And you will have to manually execute a target to restore the package
   Again this is strickly for build tools tests that will be run against this repo -->
   <Import Condition="Exists($(PkgLocalDir))" Project="$(PkgLocalDir)\CI.Bootstrap.targets" />
-  <Import Condition="!Exists($(PkgLocalDir))" Project="CI.Bootstrap.targets" Sdk="Microsoft.Internal.NetSdkBuild.Mgmt.Tools" Version="0.12.0-dev.20210304.2" />
+  <Import Condition="!Exists($(PkgLocalDir))" Project="CI.Bootstrap.targets" Sdk="Microsoft.Internal.NetSdkBuild.Mgmt.Tools" Version="$(PkgVersion)" />
   <Import Project="$(RepoRoot)\tools\bootstrapTools\bootstrap.targets" />
   <PropertyGroup>
     <SignAssembly>true</SignAssembly>