[main] Update common Docker engineering infrastructure with latest (#1185)

Author: dotnet-docker-bot

eng/common/templates/variables/docker-images.yml

@@ -1,5 +1,5 @@
 variables:
-  imageNames.imageBuilderName: mcr.microsoft.com/dotnet-buildtools/image-builder:2566544
+  imageNames.imageBuilderName: mcr.microsoft.com/dotnet-buildtools/image-builder:2570468
   imageNames.imageBuilder: $(imageNames.imageBuilderName)
   imageNames.imageBuilder.withrepo: imagebuilder-withrepo:$(Build.BuildId)-$(System.JobId)
   imageNames.testRunner: mcr.microsoft.com/dotnet-buildtools/prereqs:cbl-mariner2.0-docker-testrunner

eng/common/templates/variables/dotnet/common.yml

@@ -29,7 +29,7 @@ variables:
 - name: windowsServer2016PublicPoolImage
   value: Server2016-NESDockerBuilds
 - name: windowsServer2016InternalPoolImage
-  value: Server2016-NESDockerBuilds-PT
+  value: Server2016-NESDockerBuilds-1ESPT
 - name: windowsServer2016PoolName
   value: Docker-2016-${{ variables['System.TeamProject'] }}