Docker Compose PostgreSQL 18 (#8111)

Update to version 18.
https://www.postgresql.org/about/news/postgresql-18-released-3142/
Tested to work: Debian, Alpine, PHP 8.2, PHP 8.4.

Docker/freshrss/docker-compose-db.yml

@@ -3,7 +3,7 @@ volumes:
 
 services:
   freshrss-db:
-    image: postgres:17
+    image: postgres:18
     container_name: freshrss-db
     hostname: freshrss-db
     restart: unless-stopped

Docker/freshrss/docker-compose.yml

@@ -7,7 +7,7 @@ services:
     image: freshrss/freshrss:latest
     # # Optional build section if you want to build the image locally:
     # build:
-    #   # Pick #latest (slow releases) or #edge (rolling release) or a specific release like #1.21.0
+    #   # Pick #latest (slow releases) or #edge (rolling release) or a specific release like #1.27.1
     #   context: https://github.com/FreshRSS/FreshRSS.git#latest
     #   dockerfile: Docker/Dockerfile-Alpine
     container_name: freshrss