chore: Squelch celery deprecation warning (ietf-tools#6662)

Author: jennifer-richards

ietf/settings.py

@@ -1153,6 +1153,7 @@ def skip_unreadable_post(record):
 CELERY_BROKER_URL = 'amqp://mq/'
 CELERY_BEAT_SCHEDULER = 'django_celery_beat.schedulers:DatabaseScheduler'
 CELERY_BEAT_SYNC_EVERY = 1  # update DB after every event
+CELERY_BROKER_CONNECTION_RETRY_ON_STARTUP = True  # the default, but setting it squelches a warning
 
 # Meetecho API setup: Uncomment this and provide real credentials to enable
 # Meetecho conference creation for interim session requests