Prepare for upgrade to Cloud Composer version 2.6.5 with airflow 2.5.3

[mjumbewu]

Description

Updated the files to test the Cloud Composer 2.6.5 setup locally.

Relates to issue #3551.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

How has this been tested?

Docker containers were built locally by:

• Removing previously built airflow images (including the airflow_postgres-db-volume volume)
• Running docker compose run airflow db init and docker compose up
• Checking the Airflow UI in the browser and the terminal logs for errors

Post-merge follow-ups

• No action required
• Actions required (specified below)
  1. Pause all the DAGs
  2. Create a snapshot of the current environment:

  gcloud composer environments snapshots save \
    calitp-airflow2-prod-composer2-patch \
    --location us-west2 \
    --project cal-itp-data-infra
  

  3. Upgrade the image:

  gcloud composer environments update \
    calitp-airflow2-prod-composer2-patch \
    --location us-west2 \
    --project cal-itp-data-infra \
    --image-version composer-2.10.2-airflow-2.10.2
  

  4. Unpause DAGs