Upgrade to Postgres 17 (#735)

This updates the Postgres stub to use the newly release and latest version 17: https://www.postgresql.org/docs/17/release-17.html

The official Docker image is here: https://github.com/docker-library/postgres/blob/172544062d1031004b241e917f5f3f9dfebc0df5/17/bookworm/Dockerfile

stubs/pgsql.stub

@@ -1,5 +1,5 @@
 pgsql:
-    image: 'postgres:15'
+    image: 'postgres:17'
     ports:
         - '${FORWARD_DB_PORT:-5432}:5432'
     environment: