Bump django-celery-results from 1.1.2 to 2.4.0 in /mooclet_engine

Bumps [django-celery-results](https://github.com/celery/django-celery-results) from 1.1.2 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](celery/django-celery-results@1.1.2...v2.4.0)

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

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

Author: dependabot[bot]

mooclet_engine/requirements_base.txt

@@ -11,7 +11,7 @@ pygments==2.2.0
 markdown==2.6.11
 pycurl==7.43.0 --install-option="--with-nss"
 #celery[sqs]==4.1.1
-django-celery-results==1.0.1
+django-celery-results==2.4.0
 #django-celery-beat
 scipy==1.1.0
 drf-writable-nested==0.5.1

mooclet_engine/requirements_local_updated.txt

@@ -8,7 +8,7 @@ Click==7.0
 clickclick==1.2.2
 Django==2.2.6
 django-celery-beat==1.5.0
-django-celery-results==1.1.2
+django-celery-results==2.4.0
 django-cors-headers==3.1.1
 django-cors-middleware==1.4.0
 django-debug-toolbar==2.0