Bump django from 2.2.13 to 2.2.15 (from PR #595)
Bump django from 2.2.13 to 2.2.15 (from PR #595)

Bumps [django](https://github.com/django/django) from 2.2.13 to 2.2.15.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.13...2.2.15)

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

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