Add support for Ember v5

[SergeAstapov]

Without this change, you have an issue installing Ember.js v5:

unmet peer ember-source@^4.0.0: found 5.3.0

[lukemelia]

Hmm, any idea what's going on with CI @SergeAstapov ?

[lukemelia]

Also, this is compatible with Ember 3.28, so let's make the peer dep say as much

[SergeAstapov]

Also, this is compatible with Ember 3.28, so let's make the peer dep say as much

not sure, as both readme and CI have 4.4+, but I can update of course to be 3.28+, which I think would be separate PR.

As for CI errors

Build Error (broccoli-persistent-filter:Babel > [Babel: @ember/test-helpers]) in @ember/test-helpers/-internal/build-registry.js

[BABEL]: Cannot find module '@babel/helper-get-function-arity'

this seen like lock file needs and update + maybe some reps. I should be able to take a look into that in separate PR

[paddor]

Any updates here? I'd love to upgrade to Ember 5.x without using npm i --legacy-peer-deps.

[lukemelia]

I haven't had time to look at this myself. I'm traveling but happy to review a PR.

[lukemelia]

Handled in #129