Bump django from 5.2.10 to 5.2.11 in /backend (#2055)

Bumps [django](https://github.com/django/django) from 5.2.10 to 5.2.11.
- [Commits](django/django@5.2.10...5.2.11)

---
updated-dependencies:
- dependency-name: django
  dependency-version: 5.2.11
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]