chore(deps): bump k3s to v1.36.3 and kube-vip to v1.2.3

- Bump k3s_version to v1.36.3+k3s1 in sample group_vars
- Bump kube_vip_tag_version to v1.2.3 in group_vars, server role
  defaults and argument spec, and README variable table
- Update the kube-vip manifest regression test to assert v1.2.3
- Keep MetalLB at v0.16.0: v0.16.1 only exists as a chart-only
  metallb-chart-0.16.1 tag with no application or image release,
  so it must not be used as the controller or speaker image tag

inventory/sample/group_vars/all.yml

@@ -1,5 +1,5 @@
 ---
-k3s_version: v1.36.2+k3s1
+k3s_version: v1.36.3+k3s1
 # this is the user that has ssh access to these machines
 ansible_user: ansibleuser
 systemd_dir: /etc/systemd/system
@@ -102,7 +102,7 @@ extra_agent_args: >-
   {{ extra_args }}
 
 # image tag for kube-vip
-kube_vip_tag_version: v1.2.2
+kube_vip_tag_version: v1.2.3
 
 # enable kube-vip (covers both the control-plane VIP and service load balancing)
 # set false for a single node or when an external load balancer is used