ember-dragula: Submit PR to remove component lifecycle deprecation

# Problem

We are currently using ember-dragula for our task board.

At the moment, there is a deprecation in ember triggered by this addon, due to component lifecycle hooks.

https://emberjs.com/deprecations/v2.x/#toc_arguments-in-component-lifecycle-hooks

I've created an (issue in their repository](https://github.com/kalcifer/ember-dragula/issues/27)

## Subtasks
- [ ] If the issue has not been resolved yet, submit a PR to the ember-dragula repo
- [ ] Once the issue has been resolved and the change released as a new version, update the dependency here
- [ ] If the deprecation is gone, we can consider this issue closed.

## References

Progress on: #

Inizia esaminando l'issue di ember-dragula collegata nel report e identifica se la deprecazione del ciclo di vita del componente è stata risolta. In caso contrario, invia lì la modifica richiesta; una volta disponibile una versione rilasciata, individua la dipendenza ember-dragula in questo repository, aggiornala e verifica che la deprecazione sia scomparsa.

Scritto dal modello di indicizzazione a partire dal testo della issue.