Update dependency ember-concurrency to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-concurrency	3.1.1 -> 4.0.2
ember-concurrency	^2.1.2 || ^3.0.0 -> ^4.0.0

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Release Notes

machty/ember-concurrency (ember-concurrency)

v4.0.2

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• Make glint template an optional peer dependency (#​572)

v4.0.1

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• Update assert in task-public-api.js to include note about required Babel transform for arrow functions (#​569)

v4.0.0

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• Ember Concurrency is now a V2 Embroider Addon (#​551)
  • BREAKING CHANGE: you must now register the Babel transform used by Ember Concurrency within consuming apps and addons
    • See upgrade docs: https://ember-concurrency.com/docs/v4-upgrade
  • The guides have been updated to reflect modern/best practices:
    • Instead of using the (perform) helper, it is now recommended that the bound .perform() method on each Task be directly invoked in the template, e.g. {{on "click" this.myTask.perform}}, or, when arguments are present, {{on "click" (fn this.myTask.perform 123 'foo')}}
  • Glint template registry has been provided for EC's 3 helpers.

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