[TIDY] Update to ansible 4 module names

tasks/borgbackup-Debian-stretch.yml

@@ -9,7 +9,7 @@
 
 - name: borgbackup - Add debian repo key
   become: yes
-  apt_key:
+  ansible.builtin.apt_key:
     keyserver: pgpkeys.mit.edu
     id: 8B48AD6246925553
     state: present
@@ -17,14 +17,14 @@
     - ansible_distribution_release == 'stretch'
 - name: borgbackup - Add stretch-backports
   become: yes
-  apt_repository:
+  ansible.builtin.apt_repository:
     repo: deb http://ftp.debian.org/debian stretch-backports main
     state: present
   when:
     - ansible_distribution_release == 'stretch'
 - name: borgbackup - Install borgbackup from stretch-backports
   become: yes
-  apt:
+  ansible.builtin.apt:
     name: borgbackup
     state: latest
     default_release: stretch-backports