fix of a deprecation warining

terraform/main.tf

@@ -93,11 +93,13 @@ resource "openstack_networking_router_interface_v2" "net1_router_interface" {
 resource "random_string" "key_pair_user_name" {
   length           = 16
   special          = false
+  upper            = false
+  numeric          = false
 }
 
 # Create ssh keys
 resource "openstack_compute_keypair_v2" "user1" {
-  name       = "$random_string.key_pair_user_name.result"
+  name       = random_string.key_pair_user_name.result
   # public_key = "user1"
 }