provider/openstack: Deprecating Instance Volume attribute (#13062)
provider/openstack: Deprecating Instance Volume attribute (#13062)

This commit deprecates the volume attribute in the
openstack_compute_instance_v2 resource. It's recommended to either
use the block_device attribute or the openstack_compute_volume_attach_v2
resource.
haxorof/terraform-provider-openstack,haxorof/terraform-provider-openstack,haxorof/terraform-provider-openstack