fix: use larger disks to avoid throttling

As we saw in camunda/camunda#21758, a 32 GiB disk is slightly too small for our default workload.

charts/zeebe-benchmark/values.yaml

@@ -313,7 +313,7 @@ camunda-platform:
     # PvcAccessModes can be used to configure the persistent volume claim access mode https://kubernetes.io/docs/concepts/storage/persistent-volumes/#access-modes
     pvcAccessMode: [ "ReadWriteOnce" ]
     # PvcSize defines the persistent volume claim size, which is used by each broker pod https://kubernetes.io/docs/concepts/storage/persistent-volumes/#persistentvolumeclaims
-    pvcSize: 32Gi
+    pvcSize: 48Gi
     # PvcStorageClassName can be used to set the storage class name which should be used by the persistent volume claim. It is recommended to use a storage class, which is backed with a SSD.
     pvcStorageClassName: ssd