Bump django-extensions from 3.1.0 to 3.1.1
Bump django-extensions from 3.1.0 to 3.1.1

Bumps [django-extensions](https://github.com/django-extensions/django-extensions) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/django-extensions/django-extensions/releases)
- [Changelog](https://github.com/django-extensions/django-extensions/blob/master/CHANGELOG.md)
- [Commits](https://github.com/django-extensions/django-extensions/compare/3.1.0...3.1.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
DemocracyClub/UK-Polling-Stations,DemocracyClub/UK-Polling-Stations,DemocracyClub/UK-Polling-Stations