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](https://github.com/adamchainz/django-cors-headers/compare/4.1.0...4.2.0)

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

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

api/requirements.txt

@@ -3,7 +3,7 @@ celery~=5.3.1
 coverage~=7.2.7
 cryptography~=41.0.1
 Django~=4.2.2
-django-cors-headers~=4.1.0
+django-cors-headers~=4.2.0
 djangorestframework~=3.14.0
 django-celery-email~=3.0.0
 django-netfields~=1.3.0