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* [Bug fix] From Celery 5.0.0 the legacy task API was discontinued.
This meant that the Task base class no longer automatically registered
child tasks in Open edX Nutmeg (which uses Celery 5.2.6).
Manually register the class-based tasks on the Celery app instance.
* [BREAKING CHANGE] Update the `hastexo_guacamole_client` to
Channels 3. The asgi root application (`ASGI_APPLICATION`)
is now defined in the `asgi.py` file instead of `routing.py` file.
The asgi application now also checks for allowed hosts,
meaning if you want to allow the LMS to connect to labs via the `hastexo_guacamole_client`, the LMS host has to be listed in
`ALLOWED_HOSTS` at `hastexo_guacamole_client.settings.py`.
* [Documentation] Remove obsolete deployment instructions for the
old “native” (Ansible-based) installation, and the old Devstack.