example_project/settings.py: remove default value USE_L10N = True
https://docs.djangoproject.com/en/4.0/releases/4.0/:
Django 4.0 release notes
The default value of the USE_L10N setting is changed to True.
https://docs.djangoproject.com/en/4.0/releases/4.0/:
Django 4.0 release notes
The default value of the USE_L10N setting is changed to True.