Change module apt with multiple packages to remove deprecated syntax

tasks/alerta.yml

@@ -3,12 +3,13 @@
 
 - name: "Ensure packages"
   apt:
-    pkg: '{{ item }}'
+    pkg: '{{ packages }}'
     state: 'present'
-  with_items:
-    - 'python-pip'
-    - 'python-dev'
-    - 'python3-dev'
+  vars:
+    packages:
+      - 'python-pip'
+      - 'python-dev'
+      - 'python3-dev'
 
 - name: "Ensure PIP packages"
   pip: