Limit django-treebeard to version <5

Author: stefanw

pyproject.toml

@@ -8,7 +8,7 @@ version = "0.0.5"
 description = "Design and run workflows in Django"
 readme = "README.md"
 requires-python = ">=3.10"
-dependencies = ["django-treebeard", "python-dateutil", "django>=5.2"]
+dependencies = ["django-treebeard<5", "python-dateutil", "django>=5.2"]
 
 [dependency-groups]
 dev = [