chore(deps): update django requirement from ~=5.1.0 to ~=5.1.1 in /api

Updates the requirements on [django](https://github.com/django/django) to permit the latest version.
- [Commits](django/django@5.1...5.1.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

api/requirements.txt

@@ -2,7 +2,7 @@ captcha~=0.6.0
 celery~=5.4.0
 coverage~=7.6.0
 cryptography~=43.0.0
-Django~=5.1.0
+Django~=5.1.1
 django-cors-headers~=4.4.0
 djangorestframework~=3.14.0
 django-celery-email~=3.0.0