Bump django-celery-results from 1.0.4 to 2.4.0

Bumps [django-celery-results](https://github.com/celery/django-celery-results) from 1.0.4 to 2.4.0.
- [Release notes](https://github.com/celery/django-celery-results/releases)
- [Changelog](https://github.com/celery/django-celery-results/blob/master/Changelog)
- [Commits](https://github.com/celery/django-celery-results/compare/v1.0.4...v2.4.0)

---
updated-dependencies:
- dependency-name: django-celery-results
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -39,7 +39,7 @@ Django==2.2.4
 django-bootstrap3==11.0.0
 django-bootstrap4==0.0.7
 django-celery-beat==1.4.0
-django-celery-results==1.0.4
+django-celery-results==2.4.0
 django-cors-headers==2.5.2
 django-crispy-forms==1.7.2
 django-filter==2.1.0