[UPDATE] Update django-celery-results requirement

Updates the requirements on [django-celery-results](https://github.com/celery/django-celery-results) to permit the latest version.
- [Release notes](https://github.com/celery/django-celery-results/releases)
- [Changelog](https://github.com/celery/django-celery-results/blob/main/Changelog)
- [Commits](https://github.com/celery/django-celery-results/compare/v2.5.1...v2.6.0)

---
updated-dependencies:
- dependency-name: django-celery-results
  dependency-version: 2.6.0
  dependency-type: direct:production
...

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

pyproject.toml

@@ -50,7 +50,7 @@ dependencies = [
     "honcho>=2.0.0",
     "psutil>=7.2.2,<8.0.0",
     "celery[redis]>=5.6.2,<7",
-    "django-celery-results>=2.5.1",
+    "django-celery-results>=2.6.0",
     "django-celery-beat>=2.9.0",
 ]