Update postgres Docker tag to v16.3 (#75)

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

stack/docker-compose-refarch-base.yml

@@ -5,7 +5,7 @@ name: default-services
 services:
   postgres:
     container_name: postgres
-    image: postgres:16.0-alpine3.18
+    image: postgres:16.3-alpine3.18
     environment:
       - POSTGRES_DB=postgres
       - POSTGRES_USER=admin