chore(deps): update embroider monorepo

Author: renovate[bot]

docs-app/package.json

@@ -39,7 +39,7 @@
     "@ember/string": "^3.0.1",
     "@ember/test-helpers": "^3.1.0",
     "@embroider/compat": "^2.0.0",
-    "@embroider/core": "2.0.2",
+    "@embroider/core": "2.1.1",
     "@embroider/webpack": "^2.0.0",
     "@glimmer/component": "^1.1.2",
     "@glimmer/tracking": "^1.1.2",