Bump pylint-django from 2.0.9 to 2.0.11 in /backend
Bump pylint-django from 2.0.9 to 2.0.11 in /backend

Bumps [pylint-django](https://github.com/PyCQA/pylint-django) from 2.0.9 to 2.0.11.
- [Release notes](https://github.com/PyCQA/pylint-django/releases)
- [Changelog](https://github.com/PyCQA/pylint-django/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/PyCQA/pylint-django/compare/v2.0.9...v2.0.11)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
patrick91/pycon,patrick91/pycon