Update postgres Docker tag to v18.3 (#165)

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

Author: renovate[bot]

docker/docker-compose.yml

@@ -13,7 +13,7 @@ services:
     ports:
       - 8888:8888
   database:
-    image: postgres:18.2
+    image: postgres:18.3
     restart: always
     user: postgres
     environment: