chore(deps): update nginxproxy/acme-companion docker tag to v2.2.8

Author: renovate[bot]

docker-compose.yml

@@ -40,7 +40,7 @@ services:
       - proxy
 
   acme-companion:
-    image: nginxproxy/acme-companion:2.1.1
+    image: nginxproxy/acme-companion:2.2.8
     container_name: acme-companion
     depends_on:
       - nginx-proxy