[deps] Update django-storages requirement in /images

Updates the requirements on [django-storages](https://github.com/jschneier/django-storages) to permit the latest version.
- [Changelog](https://github.com/jschneier/django-storages/blob/master/CHANGELOG.rst)
- [Commits](jschneier/django-storages@1.14.4...1.14.6)

---
updated-dependencies:
- dependency-name: django-storages
  dependency-version: 1.14.6
  dependency-type: direct:production
...

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

Author: dependabot[bot]

images/openwisp_base/requirements.txt

@@ -11,5 +11,5 @@ django-celery-email~=3.0.0
 tldextract~=5.1.3
 # these add support for object storage
 # (eg: Amazon S3, GCS)
-django-storages~=1.14.4
+django-storages~=1.14.6
 boto3~=1.37.25