prow-build: use hyperdisk-balanced disks for prometheus

Signed-off-by: Marko Mudrinić <[email protected]>

Author: xmudrii

infra/gcp/terraform/k8s-infra-prow-build/prow-build/resources/monitoring/prometheus-main/prometheus.yaml

@@ -42,7 +42,7 @@ spec:
   storage:
     volumeClaimTemplate:
       spec:
-        storageClassName: standard-rwo
+        storageClassName: hyperdisk-balanced
         resources:
           requests:
             storage: 300Gi