feat: update PostgreSQL image to version 18-bookworm and adjust volume paths

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   db:
-    image: postgres:16
+    image: postgres:18-bookworm
     environment:
       POSTGRES_USER: ${POSTGRES_USER}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
@@ -11,7 +11,7 @@ services:
     expose:
       - 5432
     volumes:
-      - dbdata:/var/lib/postgresql/data
+      - dbdata_v18:/var/lib/postgresql
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -d $${POSTGRES_DB} -U $${POSTGRES_USER}"]
       interval: 1s
@@ -226,4 +226,4 @@ volumes:
   storage_data:
   tiles-data:
   keydb-data:
-  dbdata:
+  dbdata_v18: