Update octavia amphora image to noble

Author: bjoernt

ansible/roles/octavia_preconf/defaults/main.yml

@@ -32,7 +32,7 @@ lb_mgmt_secgrp_name: "lb-mgmt-secgroup"
 # these are the defaults for the flavor, image and ssh keypair
 amphora_ssh_key_name: amphora-ssh-key
 amphora_flavor_name: m1.amphora
-amphora_image_version: focal
+amphora_image_version: noble
 amphora_image_name: amphora-ubuntu-{{ amphora_image_version }}
 amphora_image_url: "https://tarballs.opendev.org/openstack/octavia/test-images/test-only-amphora-x64-haproxy-ubuntu-{{ amphora_image_version }}.qcow2"