refactor: Update OpenStack block storage volume configuration

- Changed the version of "openstack_blockstorage_volume_v2" to "openstack_blockstorage_volume_v3" for both "disk" and "disk2."

main.tf

@@ -55,8 +55,8 @@ output "keypair_name" {
 }
 
 data "openstack_networking_network_v2" "external_net" {name = var.external_network}
-data "openstack_blockstorage_volume_v2" "disk" {name = var.data_volume}
-data "openstack_blockstorage_volume_v2" "disk2" {name = var.xdmod_queue_data_volume}
+data "openstack_blockstorage_volume_v3" "disk" {name = var.data_volume}
+data "openstack_blockstorage_volume_v3" "disk2" {name = var.xdmod_queue_data_volume}
 
 # runs the ohpc-instance module - creates ohpc instance using variables defined above
 # calls functions from dmz-network, import-keypair, and floating-ip-address modules to get values created there for use