chore(deps): update embroider monorepo to v4

Author: renovate[bot]

packages/test-app/package.json

@@ -31,8 +31,8 @@
     "@embroider/compat": "3.6.1",
     "@embroider/core": "3.4.16",
     "@embroider/macros": "1.16.6",
-    "@embroider/test-setup": "3.0.3",
-    "@embroider/webpack": "3.2.3",
+    "@embroider/test-setup": "4.0.0",
+    "@embroider/webpack": "4.0.8",
     "@glimmer/component": "1.1.2",
     "@glimmer/tracking": "1.1.2",
     "@tsconfig/ember": "3.0.8",