deps: bump django-cors-headers from 4.6.0 to 4.9.0 in /Piicasso/backend

Bumps [django-cors-headers](https://github.com/adamchainz/django-cors-headers) from 4.6.0 to 4.9.0.
- [Changelog](https://github.com/adamchainz/django-cors-headers/blob/main/CHANGELOG.rst)
- [Commits](adamchainz/django-cors-headers@4.6.0...4.9.0)

---
updated-dependencies:
- dependency-name: django-cors-headers
  dependency-version: 4.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Piicasso/backend/requirements.txt

@@ -6,7 +6,7 @@
 Django==5.2.4
 djangorestframework==3.15.2
 djangorestframework-simplejwt==5.3.1
-django-cors-headers==4.6.0
+django-cors-headers==4.9.0
 
 # API documentation
 drf-spectacular==0.28.0