fix(deps): update dependency ember-concurrency to v5

Author: renovate[bot]

packages/test-app/package.json

@@ -86,7 +86,7 @@
   "dependencies": {
     "@ember-data/json-api": "^5.3.8",
     "@ember-data/store": "^5.3.8",
-    "ember-concurrency": "^4.0.2",
+    "ember-concurrency": "^5.0.0",
     "ember-in-viewport": "^4.1.0",
     "ember-scroll-modifiers": "^7.3.0",
     "ember-truth-helpers": "^4.0.3",