fix(test_postgresql): bad int() usage

tests/test_postgresql.py

@@ -498,7 +498,7 @@ def main():
 
     # get database configuration
     db_host = conf.get("DB_HOST", "127.0.0.1")
-    db_port = conf.get(int("DB_PORT"), 5432)
+    db_port = int(conf.get("DB_PORT", 5432))
     db_user = conf.get("DB_USER", "postgres")
     db_pass = conf.get("DB_PG_ROOT_PWD")
     db_conf = {"host": db_host, "port": db_port, "user": db_user, "pass": db_pass}