Need newer typescript for the JS to TS codemod for the docs app

Author: NullVoxPopuli

docs/package.json

@@ -54,7 +54,7 @@
     "ember-page-title": "8.1.0",
     "ember-qunit": "^8.0.2",
     "ember-resolver": "^11.0.1",
-    "ember-source": "~3.28.3",
+    "ember-source": "~5.5.0",
     "ember-source-channel-url": "^3.0.0",
     "ember-template-lint": "^5.13.0",
     "ember-truth-helpers": "^4.0.3",