Remove AfterTargets to workaround xbuild bug

https://bugzilla.xamarin.com/show_bug.cgi?id=44475

Author: AArnott

src/Nerdbank.GitVersioning.NuGet/build/NerdBank.GitVersioning.targets

@@ -79,7 +79,6 @@
 
   <Target Name="SetCloudBuildVersionVars"
         DependsOnTargets="GetBuildVersion"
-        AfterTargets="GetBuildVersion"
         Condition=" '@(CloudBuildVersionVars)' != '' ">
     <Nerdbank.GitVersioning.Tasks.SetCloudBuildVariables
       CloudBuildVersionVars="@(CloudBuildVersionVars)">
@@ -92,7 +91,6 @@
 
   <Target Name="SetCloudBuildNumberWithVersion"
         DependsOnTargets="GetBuildVersion"
-        AfterTargets="GetBuildVersion"
         Condition=" '$(CloudBuildNumber)' != '' ">
     <Nerdbank.GitVersioning.Tasks.SetCloudBuildVariables
       CloudBuildNumber="$(CloudBuildNumber)">