[deps] Update django-cors-headers requirement from ~=4.4.0 to ~=4.6.0

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@4.4.0...4.6.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements-test.txt

@@ -1,5 +1,5 @@
 openwisp-utils[qa,selenium]~=1.1.0
-django-cors-headers~=4.4.0
+django-cors-headers~=4.6.0
 django-redis~=5.4.0
 channels_redis~=4.2.0
 pytest-asyncio~=0.24.0