Update dependency django to ==6.0.*

Author: renovate[bot]

pyproject.toml

@@ -46,7 +46,7 @@ dev = [
   "pytest==9.0.2",
   "pytest-mypy-plugins==3.2.0",
   "djangorestframework==3.16.1",
-  "django==5.2.*; python_version < '3.12'",
+  "django==6.0.*; python_version < '3.12'",
   "django==6.0.*; python_version >= '3.12'",
   "types-pytz==2025.2.0.20251108",
   "types-requests==2.32.4.20250913",