playbook: Convert to a list

playbook/roles/repository/tasks/debian_init.yml

-
   - name: Allow release-info to change for APT repositories
     command: apt-get update -y --allow-releaseinfo-change
     when: (ansible_distribution == "Debian" and ansible_ditribution_major_version|int > 9) or
           (ansible_ditribution == "Ubuntu" and ansible_ditribution_major_version|int > 18)
 
   - name: Install gpg using apt
-    apt: name=gpg state=present
+    apt:
+      name:
+      - gpg
+      state: present
     when: ansible_distribution == "Debian" and ansible_distribution_major_version == "10"