settings.ROOT_URLCONF has existed since forever -- or at least from:
1.8 https://docs.djangoproject.com/en/1.8/ref/settings/#root-urlconf to:
5.2 https://docs.djangoproject.com/en/5.2/ref/settings/#root-urlconf
python version: 3.11.12
django version: 5.2.7
mypy version: 1.13.0
django-stubs version: 5.2.7