roles/common: remove cron-apt

Use unattended-upgrades instead. It has sane defaults on Debian at
least (I haven't checked Ubuntu).

roles/common/tasks/cron-apt.yml

@@ -1,11 +1,17 @@
 ---
-- name: Configure cron-apt (config)
-  ansible.builtin.copy: src={{ item.src }} dest={{ item.dest }} mode={{ item.mode }} owner={{ item.owner }} group={{ item.group }}
-  loop:
-    - { src: etc/cron-apt/config, dest: /etc/cron-apt/config, mode: "0644", owner: root, group: root }
-    - { src: etc/cron-apt/3-download, dest: /etc/cron-apt/action.d/3-download, mode: "0644", owner: root, group: root }
+- name: Remove cron-apt
+  ansible.builtin.apt:
+    name: cron-apt
+    state: absent
+    cache_valid_time: 3600
 
-- name: Configure cron-apt (security)
-  ansible.builtin.template: src=security.sources.list.j2 dest=/etc/apt/security.sources.list mode=0644 owner=root group=root
+- name: Remove cron-apt configs
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: absent
+  loop:
+    - /etc/cron-apt/config
+    - /etc/cron-apt/action.d/3-download
+    - /etc/apt/security.sources.list
 
 # vim: set ts=2 sw=2: