Fix apt module loop to avoid deprecation notices

[DEPRECATION WARNING]: Invoking "apt" only once while using a loop via
squash_actions is deprecated. Instead of using a loop to supply multiple items
and specifying `name: "{{ item }}"`, please use `name: ['php5.6-common',
'php7.0-common', 'php7.1-common', 'php7.2-common', 'php7.3-common']` and remove
the loop. This feature will be removed in version 2.11. Deprecation warnings
can be disabled by setting deprecation_warnings=False in ansible.cfg.

tasks/setup-Debian.yml

@@ -46,8 +46,9 @@
 # PHP package purges.
 - name: Purge PHP version packages.
   apt:
-    name: ['php5.6-common', 'php7.0-common', 'php7.1-common', 'php7.2-common', 'php7.3-common']
+    name: "{{ __php_versions_debian |
+              reject('search', 'php' ~ php_version) |
+              list }}"
     state: absent
     purge: true
     force: true
-  when: "'php' + php_version not in item"

vars/Debian.yml

@@ -37,3 +37,10 @@ __php_packages:
   - "php{{ php_version }}-sqlite3"
   - "php{{ php_version }}-xml"
   - "php{{ php_version }}-yaml"
+
+__php_versions_debian:
+  - php5.6-common
+  - php7.0-common
+  - php7.1-common
+  - php7.2-common
+  - php7.3-common