build(deps-dev): update django-debug-toolbar requirement

Updates the requirements on [django-debug-toolbar](https://github.com/django-commons/django-debug-toolbar) to permit the latest version.
- [Release notes](https://github.com/django-commons/django-debug-toolbar/releases)
- [Changelog](https://github.com/django-commons/django-debug-toolbar/blob/main/docs/changes.rst)
- [Commits](django-commons/django-debug-toolbar@5.0.1...6.0.0)

---
updated-dependencies:
- dependency-name: django-debug-toolbar
  dependency-version: 6.0.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -1,6 +1,6 @@
 Django~=5.1.0
 djangorestframework~=3.15.2
 django-filter~=24.2.0
-django-debug-toolbar~=5.0.1
+django-debug-toolbar~=6.0.0
 django-dbbackup~=4.2.0
 -r requirements-test.txt