Upgrade to Django 4
Django 3.2 LTS will end its support in December 7th 2023.
https://www.djangoproject.com/download/
The current limitations for upgrading include:
- Potential breaking changes between versions (to be checked)
- Replace django-excel with an alternative maintained package,
django-import-export
e.g., https://django-import-export.readthedocs.io/en/stable/ , see #530