More ansible-lint fixes

roles/matrix-base/tasks/server_base/setup_raspbian.yml

@@ -10,7 +10,7 @@
     update_cache: true
 
 - name: Ensure Docker's APT key is trusted
-  apt_key:
+  ansible.builtin.apt_key:
     url: https://download.docker.com/linux/raspbian/gpg
     id: 9DC858229FC7DD38854AE2D88D81803C0EBFCD88
     state: present
@@ -19,7 +19,7 @@
   when: matrix_docker_installation_enabled | bool and matrix_docker_package_name == 'docker-ce'
 
 - name: Ensure Docker repository is enabled
-  apt_repository:
+  ansible.builtin.apt_repository:
     repo: "deb [arch={{ matrix_debian_arch }}] https://download.docker.com/linux/raspbian {{ ansible_distribution_release }} stable"
     state: present
     update_cache: true