Widen test-waiters range in @embroider/router

Author: NullVoxPopuli

packages/router/package.json

@@ -33,7 +33,7 @@
     "publishTag": "2.x"
   },
   "dependencies": {
-    "@ember/test-waiters": "^3.0.2",
+    "@ember/test-waiters": "^3.0.2 || ^4.0.0",
     "@embroider/addon-shim": "^1.10.0"
   },
   "devDependencies": {