chore(deps-dev): bump ember-concurrency from 3.1.1 to 4.0.0

Bumps [ember-concurrency](https://github.com/machty/ember-concurrency) from 3.1.1 to 4.0.0.
- [Release notes](https://github.com/machty/ember-concurrency/releases)
- [Changelog](https://github.com/machty/ember-concurrency/blob/master/CHANGELOG.md)
- [Commits](machty/ember-concurrency@3.1.1...4.0.0)

---
updated-dependencies:
- dependency-name: ember-concurrency
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -73,7 +73,7 @@
     "ember-cli-sri": "2.1.1",
     "ember-cli-terser": "4.0.2",
     "ember-cli-test-loader": "3.1.0",
-    "ember-concurrency": "3.1.1",
+    "ember-concurrency": "4.0.0",
     "ember-data": "5.3.0",
     "ember-flatpickr": "4.0.0",
     "ember-load-initializers": "2.1.2",