use json.dumps format to print dag_run's

import argparse

import os

import json

import joblib

    print(f">>> `dag_run_list` : [ {n_dag_run_success} / {n_dag_run_all} ]")

    if len(dag_run_list) > 0:

        for dag_run in dag_run_list:

            print(f"\t- {dag_run}")

            print(f"\t- {json.dumps(dag_run, separators=(',', ':'))}")

# dump dag_group_run

joblib.dump(