fix: correct references to resource in NetBox virtual machine configuration for FTP server

terraform/hetzner_ftp_server.tf

@@ -10,6 +10,6 @@ resource "hcloud_server" "ftp-server" {
 }
 
 resource "netbox_virtual_machine" "ftp-server" {
-  name       = data.hcloud_server.ftp-server.name
-  cluster_id = data.netbox_cluster.hetzner_cluster.id
+  name       = resource.hcloud_server.ftp-server.name
+  cluster_id = resource.netbox_cluster.hetzner_cluster.id
 }