chore(deps): update dependency community.docker to v4 (#827)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

README.md

@@ -59,7 +59,7 @@ This will also ensure you are deploying/running this role with a fully tested ve
     - name: community.crypto # Only required if you plan to install NGINX Plus
       version: 2.22.3
     - name: community.docker # Only required if you plan to use Molecule (see below)
-      version: 3.13.3
+      version: 4.1.0
   ```
 
 - You will need to run this role as a root user using Ansible's `become` parameter. Make sure you have set up the appropriate permissions on your target hosts.