🐳 fix: replace full database permissions with superuser permissions for test database user

Author: svenvandescheur

backend/docker-services/openzaak/docker-init-open-zaak-db/0001-docker-init-db.sql

@@ -1,5 +1,5 @@
 CREATE USER openzaak;
 CREATE DATABASE openzaak;
-GRANT ALL PRIVILEGES ON DATABASE openzaak TO openzaak;
+ALTER USER openzaak WITH superuser;
 -- On Postgres 15+, connect to the database and grant schema permissions.
 -- GRANT USAGE, CREATE ON SCHEMA public TO openzaak;