refactor: yml -> yaml

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/k3s_loadbalancer/tasks/main.yaml

@@ -1,9 +1,9 @@
 ---
 - name: Installation
-  ansible.builtin.include_tasks: installation.yml
+  ansible.builtin.include_tasks: installation.yaml
 
 - name: Configure
-  ansible.builtin.include_tasks: configuration.yml
+  ansible.builtin.include_tasks: configuration.yaml
 
 - name: Setup DNS on Netcup
   community.general.netcup_dns: