Oscar 3.0.1 release notes

This is Oscar 3.0.1, a bugfix release.

Bug fixes

Pinned the dependency of django-treebeard to version 4.4.x, because of a breaking change introduced in version 4.5 that requires database migrations. It is likely
Fix static imports of AlertsDispatcher that should be dynamic, and move alert queryset generation into an overridable class.
Add a method to ProductAttributesContainer to allow refresh of product attribute values from the database without reloading the whole product instance.