Bump celery from 4.2.1 to 5.0.5

Bumps [celery](https://github.com/celery/celery) from 4.2.1 to 5.0.5.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/master/Changelog.rst)
- [Commits](celery/celery@v4.2.1...v5.0.5)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -2,7 +2,7 @@ django==2.2.13
 django-bootstrap3==9.1.0 
 psutil==5.6.6 
 docker==3.3.0
-celery==4.2.1
+celery==5.0.5
 sqlalchemy==1.3.0
 redis==2.10.6
 uwsgi==2.0.17.1