[deps] Migrate from django-celery-email to django-celery-email-reboot#524

nemesifier merged 5 commits intoopenwisp:masteropenwisp/docker-openwisp:masterfrom

Adityashandilya555:test-celery-email-rebootAdityashandilya555/docker-openwisp:test-celery-email-rebootCopy head branch name to clipboard