[I] Slack notifications stopped working after upgrade to 3.0.1 [airflow]

[via GitHub]

arturzangiev opened a new issue, #50754:
URL: https://github.com/apache/airflow/issues/50754

   ### Apache Airflow version
   
   3.0.1
   
   ### If "Other Airflow 2 version" selected, which one?
   
   _No response_
   
   ### What happened?
   
   Slack notifications stopped working after upgrade to 3.0.1 
   
   ### What you think should happen instead?
   
   Should send a slack notification to the channel
   
   ### How to reproduce
   
   ```
   with DAG(
       dag_id='name',
       default_args=default_args,
       description='description',
       schedule=None,
       start_date=datetime.now() - timedelta(days=365),
       catchup=False,
       max_active_runs=1,
       on_failure_callback=[
           send_slack_webhook_notification(
               slack_webhook_conn_id="slackwebhook", 
               text="The dag `{{ dag.dag_id }}` failed"
           )
       ]
   ) as dag:
   
       def fail_task():
           raise ValueError("This task fails on purpose.")
   
       task1 = PythonOperator(
           task_id='fail_task',
           python_callable=fail_task
       )
   ```
   
   ### Operating System
   
   debian
   
   ### Versions of Apache Airflow Providers
   
   apache-airflow-providers-slack 9.0.5
   
   ### Deployment
   
   Docker-Compose
   
   ### Deployment details
   
   _No response_
   
   ### Anything else?
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [x] I agree to follow this project's [Code of 
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
   


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