[deps] Update django-cors-headers requirement from ~=4.4.0 to ~=4.7.0

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...4.7.0)

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

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

Author: dependabot[bot]

requirements-test.txt

@@ -1,4 +1,4 @@
 openwisp-utils[qa,selenium,channels,channels-test] @ https://github.com/openwisp/openwisp-utils/tarball/1.2
-django-cors-headers~=4.4.0
+django-cors-headers~=4.7.0
 django-redis~=6.0.0
 freezegun~=1.5.5