chore: replace postgres rc1 image by final version

Author: Kumzy

src/pytest_databases/docker/docker-compose.postgres.yml

@@ -42,7 +42,7 @@ services:
   postgres17:
     networks:
       - default
-    image: postgres:17rc1
+    image: postgres:17
     ports:
       - "${POSTGRES17_PORT:-5428}:5432" # use a non-standard port here
     environment: