Update ember-concurrency version. Required in Ember 3.10

[danDanV1]

Fails in Ember 3.10, throws the following:
metal.js:2877 Uncaught TypeError: Found non-callable @@iterator
at new ComputedProperty (metal.js:2877)
at new TaskProperty (-task-property.js:398)
at task (index.js:58)
at Module.callback (base-component.js:23)

Because the ember-concurrency version is only 0.8. This is fixed in new versions and currently 1.0.0 is out.

I was going to do a pull request, but not all the tests were passing on 0.6.3 release?

[jkeen]

@edeis53 I was able to kinda work around this by specifying resolutions in package.json, but updating this dependency is still a good move

  "resolutions": {
    "ember-concurrency": "1.0.0"
  }