Bump django from 4.2.5 to 4.2.6 in /backend

Bumps [django](https://github.com/django/django) from 4.2.5 to 4.2.6.
- [Commits](django/django@4.2.5...4.2.6)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/requirements.txt

@@ -12,7 +12,7 @@ beautifulsoup4==4.12.2
     # via -r requirements.in
 dj-database-url==2.1.0
     # via -r requirements.in
-django==4.2.5
+django==4.2.6
     # via
     #   -r requirements.in
     #   dj-database-url