chore(deps): update caddy docker tag to v2.9.1 (#406)

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

Author: renovate[bot]

docker-compose.yml

@@ -47,7 +47,7 @@ services:
 
   #Run npm run build-watch in local before this.
   frontend:
-    image: caddy:2.8.4-alpine
+    image: caddy:2.9.1-alpine
     working_dir: /app
     volumes:
       - ./frontend/Caddyfile:/etc/caddy/Caddyfile