Update dependency ember-source to v4

Author: renovate-bot

package.json

@@ -51,7 +51,7 @@
     "ember-page-title": "7.0.0",
     "ember-qunit": "5.1.5",
     "ember-resolver": "8.0.3",
-    "ember-source": "3.28.9",
+    "ember-source": "4.4.0",
     "ember-source-channel-url": "3.0.0",
     "ember-template-lint": "4.9.1",
     "ember-try": "2.0.0",