upgrade django to 6.0

Author: sirodoht

pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 requires-python = ">=3.13"
 dependencies = [
     "bleach[css]>=6.2.0",
-    "django==6.0rc1",
+    "django>=6.0",
     "gunicorn>=23.0",
     "latex2mathml>=3.78",
     "markdown>=3.9",