fix: add ember-concurrency as dependency

ember/package.json

@@ -54,6 +54,7 @@
  "ember-cli-sri": "^2.1.1",
  "ember-cli-terser": "^4.0.2",
  "ember-composable-helpers": "^5.0.0",
+ "ember-concurrency": "^3.0.0",
  "ember-data": "~4.11.0",
  "ember-fetch": "^8.1.2",
  "ember-flatpickr": "^4.0.0",

ember/yarn.lock

@@ -7205,6 +7205,20 @@ ember-concurrency@^2.0.0, ember-concurrency@^2.3.7:
  ember-compatibility-helpers "^1.2.0"
  ember-destroyable-polyfill "^2.0.2"
 
+ember-concurrency@^3.0.0:
+ version "3.0.0"
+ resolved "https://registry.yarnpkg.com/ember-concurrency/-/ember-concurrency-3.0.0.tgz#dc691998b08f8bb7166480229db437f92971f599"
+ integrity sha512-MUsOgl4qLkINxrY+9FuohSOsn7Ytd3xCxu9mThSrMPatxomscZz/0lT4M95S7xy2aNO4o/zGfAEULECQ09YkWA==
+ dependencies:
+ "@babel/helper-plugin-utils" "^7.12.13"
+ "@babel/types" "^7.12.13"
+ "@glimmer/tracking" "^1.0.4"
+ ember-cli-babel "^7.26.11"
+ ember-cli-babel-plugin-helpers "^1.1.1"
+ ember-cli-htmlbars "^5.7.1"
+ ember-compatibility-helpers "^1.2.0"
+ ember-destroyable-polyfill "^2.0.2"
+
 ember-cookies@^0.5.0:
  version "0.5.2"
  resolved "https://registry.yarnpkg.com/ember-cookies/-/ember-cookies-0.5.2.tgz#06e33463f2f83254fefaf224cc944dec3fb9d3ba"