Remove Windows.10.Amd64.Server20H2.Open (#43554)

Author: wtgodbe

eng/targets/Helix.Common.props

@@ -43,7 +43,6 @@
 
   <!-- x64 Queues for public helix-matrix.yml and quarantine pipelines, Windows cases-->
   <ItemGroup Condition="'$(TargetArchitecture)' == 'x64' AND '$(IsHelixDaily)' == 'true' AND '$(_UseHelixOpenQueues)' == 'true'">
-    <HelixAvailableTargetQueue Include="Windows.10.Amd64.Server20H2.Open" Platform="Windows" />
     <HelixAvailableTargetQueue Include="Windows.Amd64.Server2022.Open" Platform="Windows" />
   </ItemGroup>