update zone for cgpu tests

Author: meetrajvala

launcher/image/test/test_gpu_driver_installation_cloudbuild.yaml

@@ -3,7 +3,7 @@ substitutions:
   '_IMAGE_PROJECT': ''
   '_CLEANUP': 'true'
   '_VM_NAME_PREFIX': 'cs-cgpu-test'
-  '_ZONE': 'us-west1-b'
+  '_ZONE': 'us-east1-c'
   '_WORKLOAD_IMAGE': 'us-west1-docker.pkg.dev/confidential-space-images-dev/cs-integ-test-images/gpu/cuda-vector-add:latest'
 steps:
 - name: 'gcr.io/cloud-builders/gcloud'