deps: bump django from 4.2.17 to 4.2.18

Bumps [django](https://github.com/django/django) from 4.2.17 to 4.2.18.
- [Commits](django/django@4.2.17...4.2.18)

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

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

requirements.txt

@@ -39,7 +39,7 @@ cryptography==44.0.0
     #   drf-oidc-auth
 deprecation==2.1.0
     # via django-helusers
-django==4.2.17
+django==4.2.18
     # via
     #   -r requirements.in
     #   django-anymail