fix(airflowrt): make AF3 DAG parse test compatible with Airflow 3.3

[nickypy]

Description

This PR fixes the DAG parse test to be compatible with Airflow 3.3

🎟 Issue(s)

N/A

🧪 Functional Testing

Took a locally built version of the CLI, and ran ./astro deploy to create a new deployment with the 3.3 runtime

📸 Screenshots

N/A

📋 Checklist

• Rebased from the main (or release if patching) branch (before testing)
• Ran make test before taking out of draft
• Ran make lint before taking out of draft
• Added/updated applicable tests
• Tested against Astro-API (if necessary).
• Tested against Houston-API and Astronomer (if necessary).
• Communicated to/tagged owners of respective clients potentially impacted by these changes.
• Updated any related documentation