[UPDATE] 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](https://github.com/django-commons/django-debug-toolbar/compare/5.2.0...6.0.0)

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

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

pyproject.toml

@@ -63,7 +63,7 @@ prod = [
     "psycopg[c]>=3.2.9,<4.0.0",
 ]
 dev = [
-    "django-debug-toolbar>=5.2.0,<6.0.0",
+    "django-debug-toolbar>=5.2.0,<7.0.0",
     "ipython<10.0.0,>=9.0.2",
     "pre-commit<5.0.0,>=4.1.0",
     "ruff>=0.11.13,<1.0.0",