chore: update django requirement from ~=3.0 to ~=4.0 in /api

Updates the requirements on [django](https://github.com/django/django) to permit the latest version.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@3.0...4.0.3)

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

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

Author: dependabot[bot]

api/requirements.txt

@@ -1,7 +1,7 @@
 # This file is auto-generated by tools/extract-requirements.sh.
 # Please do not edit this file, edit the setup.py file!
 coreapi
-django~=3.0
+django~=4.0
 django-filter
 djangorestframework
 drf-spectacular

api/setup.py

@@ -30,7 +30,7 @@
     },
     install_requires=[
         "coreapi",
-        "django~=3.0",
+        "django>=3,<5",
         "djangorestframework",
         "django-filter",
         "drf-spectacular",