Bump django from 1.7 to 1.11.23

Bumps [django](https://github.com/django/django) from 1.7 to 1.11.23.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/1.7...1.11.23)

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