Bump django-cors-headers from 4.2.0 to 4.3.1 in /src/requirements

Bumps [django-cors-headers](https://github.com/adamchainz/django-cors-headers) from 4.2.0 to 4.3.1.
- [Changelog](https://github.com/adamchainz/django-cors-headers/blob/main/CHANGELOG.rst)
- [Commits](adamchainz/django-cors-headers@4.2.0...4.3.1)

---
updated-dependencies:
- dependency-name: django-cors-headers
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/requirements/production.txt

@@ -10,7 +10,7 @@ django-allauth==0.57.0
 django-allauth-2fa==0.11.1
 django-bleach==3.1.0
 django-bootstrap3==23.4
-django-cors-headers==4.2.0
+django-cors-headers==4.3.1
 django-extensions==3.2.3
 django-filter==23.3
 django-leaflet==0.29.0