Update dependency ember-concurrency to v4.0.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ember-concurrency	4.0.4 -> 4.0.6

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Release Notes

machty/ember-concurrency (ember-concurrency)

v4.0.6

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More V5 deprecations (#​592):

• rm reference to Ember._setComputedDecorator
• deprecate any form of the task() constructor other than task([{}], async () => {})
  • The only allowable use is the one with async arrow fn that gets transpiled by our babel codemod.

v4.0.5

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Begin adding V5 deprecations (#​591):

• Deprecated:
  • Decorator APIs
    • Decorators don't play well with TS - use modern taskName = task(async () => {}) syntax instead
  • waitForProperty
    • Relies on legacy observers.
  • Task Groups
    • Awkward to continue to support, overloaded as a concept in general

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