fix ember-source peer declaration

Author: mansona

packages/ember-cli-fastboot/package.json

@@ -96,7 +96,7 @@
     "webpack": "^5.91.0"
   },
   "peerDependencies": {
-    "ember-source": "^4.0.0"
+    "ember-source": ">=3.16"
   },
   "engines": {
     "node": "14.* || 16.* || >= 18"