Update docker.io/library/redis Docker tag to v8

roles/docker/tasks/main/01_repo_setup.yaml

@@ -9,7 +9,7 @@
 
 - name: Ensure Docker APT repository is added
   ansible.builtin.apt_repository:
-    repo: "deb [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/docker.asc] https://download.docker.com/linux/debian {{ ansible_facts['distribution_release'] }} stable"
+    repo: "deb [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/docker.asc] https://download.docker.com/linux/debian {{ ansible_distribution_release }} stable"
     filename: docker
     state: present
   become: true