Bug: Populate new columns from airtables transit services to bigquery

[vevetron]

Describe the bug

Due to the way this is written, new tables don't appear in bigquery automagically: https://github.com/cal-itp/data-infra/blob/main/airflow/dags/create_external_tables/airtable/external_airtable_california_transit_services.yml

Expected behavior All the missing columns appear in bigquery!