chore(deps): update dependency django-stubs to v5.2.8

Author: renovate[bot]

pyproject.toml

@@ -27,7 +27,7 @@ test = [
 types = [
   "celery-types==0.23.0",
   "django-stubs-ext==5.2.8",
-  "django-stubs[compatible-mypy]==5.2.7",
+  "django-stubs[compatible-mypy]==5.2.8",
   "mypy==1.18.2",
   "types-dateparser==1.2.2.20250809",
   "types-python-dateutil==2.9.0.20251115",