Update build images

Author: akoeplinger

ci/azure-pipelines.yaml

@@ -334,10 +334,10 @@ stages:
         pool:
           ${{ if eq(variables['_RunAsInternal'], 'False') }}:
             name: NetCore-Public
-            demands: ImageOverride -equals Build.Windows.10.Amd64.VS2019.Open
+            demands: ImageOverride -equals windows.vs2019.amd64.open
           ${{ if eq(variables['_RunAsInternal'], 'True') }}:
             name: NetCore1ESPool-Internal
-            demands: ImageOverride -equals Build.Windows.10.Amd64.VS2019
+            demands: ImageOverride -equals windows.vs2019.amd64
         workspace:
           clean: all
         steps: