chore(deps): update django-cors-headers requirement in /api

Updates the requirements on [django-cors-headers](https://github.com/adamchainz/django-cors-headers) to permit the latest version.
- [Changelog](https://github.com/adamchainz/django-cors-headers/blob/main/CHANGELOG.rst)
- [Commits](adamchainz/django-cors-headers@4.7.0...4.8.0)

---
updated-dependencies:
- dependency-name: django-cors-headers
  dependency-version: 4.8.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

api/requirements.txt

@@ -3,7 +3,7 @@ celery~=5.5.3
 coverage~=7.10.6
 cryptography~=45.0.7
 Django~=5.2.3
-django-cors-headers~=4.7.0
+django-cors-headers~=4.8.0
 djangorestframework~=3.16.1
 django-celery-email~=3.0.0
 django-netfields~=1.3.2