Airflow - 2.7.3

Significant Changes

No significant changes.

Fix pre-mature evaluation of tasks in mapped task group (#34337)
Add TriggerRule missing value in rest API (#35194)
Fix Scheduler crash looping when dagrun creation fails (#35135)
Fix test connection with codemirror and extra (#35122)
Fix usage of cron-descriptor since BC in v1.3.0 (#34836)
Fix get_plugin_info for class based listeners. (#35022)
Some improvements/fixes for dag_run and task_instance endpoints (#34942)
Fix the dags count filter in webserver home page (#34944)
Return only the TIs of the readable dags when ~ is provided as a dag_id (#34939)
Fix triggerer thread crash in daemon mode (#34931)
Fix wrong plugin schema (#34858)
Use DAG timezone in TimeSensorAsync (#33406)
Mark tasks with all_skipped trigger rule as skipped if any task is in upstream_failed state (#34392)
Add read only validation to read only fields (#33413)

Improve testing harness to separate DB and non-DB tests (#35160, #35333)
Add pytest db_test markers to our tests (#35264)
Add pip caching for faster build (#35026)
Upper bound pendulum requirement to <3.0 (#35336)
Limit sentry_sdk to 1.33.0 (#35298)
Fix subtle bug in mocking processor_agent in our tests (#35221)
Bump @babel/traverse from 7.16.0 to 7.23.2 in /airflow/www (#34988)
Bump undici from 5.19.1 to 5.26.3 in /airflow/www (#34971)
Remove unused set from SchedulerJobRunner (#34810)
Remove warning about max_tis per query > parallelism (#34742)
Improve modules import in Airflow core by moving some of them into a type-checking block (#33755)
Fix tests to respond to Python 3.12 handling of utcnow in sentry-sdk (#34946)
Add connexion<3.0 upper bound (#35218)
Limit Airflow to < 3.12 (#35123)
update moto version (#34938)
Limit WTForms to below 3.1.0 (#34943)

Fix variables substitution in Airflow Documentation (#34462)
Added example for defaults in conn.extras (#35165)
Update datasets.rst issue with running example code (#35035)
Remove mysql-connector-python from recommended MySQL driver (#34287)
Fix syntax error in task dependency set_downstream example (#35075)
Update documentation to enable test connection (#34905)
Update docs errors.rst - Mention sentry "transport" configuration option (#34912)
Update dags.rst to put SubDag deprecation note right after the SubDag section heading (#34925)
Add info on getting variables and config in custom secrets backend (#34834)
Document BaseExecutor interface in more detail to help users in writing custom executors (#34324)
Fix broken link to airflow_local_settings.py template (#34826)
Fixes python_callable function assignment context kwargs example in params.rst (#34759)
Add missing multiple_outputs=True param in the TaskFlow example (#34812)
Remove extraneous '>' in provider section name (#34813)
Fix imports in extra link documentation (#34547)