Automated agent pool migration

Signed-off-by: yijingyan2 <[email protected]>

Author: yijingyan2

azure-pipelines.yml

@@ -23,7 +23,7 @@ stages:
       DIFF_COVER_CHECK_THRESHOLD: 80
       DIFF_COVER_ENABLE: 'true'
     pool:
-      vmImage: ubuntu-20.04
+      vmImage: ubuntu-latest
 
     container:
       image: sonicdev-microsoft.azurecr.io:443/sonic-slave-buster:latest