[back] sec: bump django from 4.2.11 to 4.2.14 (#1995)

Bumps [django](https://github.com/django/django) from 4.2.11 to 4.2.14.
- [Commits](django/django@4.2.11...4.2.14)

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

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

backend/requirements.txt

@@ -3,7 +3,7 @@
 
 # Full stack Web Framework used for Tournesol's backend
 # https://docs.djangoproject.com
-Django==4.2.11
+Django==4.2.14
 # Used for fields computed on save for Django models
 # See https://github.com/brechin/django-computed-property/
 django-computed-property==0.3.0