chore(deps): update lscr.io/linuxserver/bookstack docker tag to v25.05.20250531

Author: renovate[bot]

traefik-letsencrypt-bookstack-docker-compose.yml

@@ -60,7 +60,7 @@ services:
     restart: unless-stopped
 
   bookstack_web:
-    image: lscr.io/linuxserver/bookstack:25.02.20250309@sha256:41917d12ea5ea06d4f389725ff4ed1adbfbace0a6ab650394ff5783ee1ff0a17
+    image: lscr.io/linuxserver/bookstack:25.05.20250531@sha256:c09ac77cda988e93d100e729819ce30e7c63c8ca3ee8849220370d861fb85214
     container_name: bookstack_web
     networks:
       - default