chore(deps): update postgres docker tag to v18

Author: renovate[bot]

.docker/docker-compose.yml

@@ -1,7 +1,7 @@
 services:
   postgres:
     container_name: postgres
-    image: 'postgres:15-alpine'
+    image: 'postgres:18-alpine'
     ports:
       - '5432:5432'
     restart: always