Bump django-celery-results from 2.3.0 to 2.3.1 in /requirements
Bump django-celery-results from 2.3.0 to 2.3.1 in /requirements

Bumps [django-celery-results](https://github.com/celery/django-celery-results) from 2.3.0 to 2.3.1.
- [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/v2.3.0...v2.3.1)

---
updated-dependencies:
- dependency-name: django-celery-results
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
coders4help/volunteer_planner,christophmeissner/volunteer_planner,pitpalme/volunteer_planner,coders4help/volunteer_planner,volunteer-planner/volunteer_planner,pitpalme/volunteer_planner,volunteer-planner/volunteer_planner,christophmeissner/volunteer_planner,coders4help/volunteer_planner,pitpalme/volunteer_planner,volunteer-planner/volunteer_planner,coders4help/volunteer_planner,christophmeissner/volunteer_planner,pitpalme/volunteer_planner,volunteer-planner/volunteer_planner,christophmeissner/volunteer_planner