Update dependency @embroider/test-setup to v4

Author: renovate[bot]

package.json

@@ -31,7 +31,7 @@
     "@ember/optional-features": "2.2.0",
     "@ember/string": "3.1.1",
     "@ember/test-helpers": "3.3.1",
-    "@embroider/test-setup": "3.0.3",
+    "@embroider/test-setup": "4.0.0",
     "@glimmer/component": "1.1.2",
     "@glimmer/tracking": "1.1.2",
     "@release-it-plugins/lerna-changelog": "5.0.0",