correct docjer image update step

tasks/main.yml

@@ -18,7 +18,8 @@
 - name: update image if needed
   docker_image:
     name: "{{ pihole_image_name }}"
-    force: yes
+    force_source: yes
+    source: pull
   when: pihole_update_container == True
 
 - name: "[docker] Setup the pi-hole docker container"
@@ -52,4 +53,4 @@
       src: 02-localresolver.conf.j2 # required. Path of a Jinja2 formatted template on the Ansible controller. This can be a relative or absolute path.
   when: pihole_local_resolver is defined
   notify: restart pihole container
-  become: yes
+  become: yes