importing inject is deprecated

[chancancode]

ember-source 6.3 now emits a deprecation for importing inject from @ember/service. This is a bit unfortunate because service is only available on ember-source 4.1+ (I think), and this addon currently supports down to 3.20.

If dropping old ember versions is acceptable then bumping to 4.4+ would solve the problem. Otherwise, it can be avoided with some boilerplate to pick service if available, and fallback to inject if not.