[notebook] fix get-deployed-sha.sh (#4674)
[notebook] fix get-deployed-sha.sh (#4674)

The default namespace of the CI job is batch-pods, so
it fails to find the notebook deployment
danking/hail,cseed/hail,cseed/hail,danking/hail,danking/hail,cseed/hail,hail-is/hail,hail-is/hail,cseed/hail,hail-is/hail,cseed/hail,hail-is/hail,hail-is/hail,hail-is/hail,danking/hail,hail-is/hail,hail-is/hail,danking/hail,cseed/hail,danking/hail,danking/hail,danking/hail,cseed/hail,cseed/hail