refactor ♻️: Refactor stat modules to use ansible.builtin.stat

This refactoring updates the usage of `stat` modules in our Ansible playbooks to utilize the `ansible.builtin.stat` module. This change ensures consistency and potentially improves compatibility with newer versions of Ansible.

tasks/subscription.yml

@@ -1,6 +1,6 @@
 ---
 - name: subscription | Check for legacy proxmoxlib.js
-  stat:
+  ansible.builtin.stat:
     path: /usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js
   register: proxmoxlib_js
 
@@ -17,7 +17,7 @@
   notify: restart pveproxy
 
 - name: subscription | Check for minified proxmoxlib.min.js (VE 8/9)
-  stat:
+  ansible.builtin.stat:
     path: /usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.min.js
   register: proxmoxlib_min_js