Update embroider monorepo to v1.20.4

Author: renovate[bot]

package.json

@@ -45,7 +45,7 @@
     "@babel/plugin-proposal-decorators": "7.29.0",
     "@ember/optional-features": "3.0.0",
     "@ember/test-helpers": "5.4.1",
-    "@embroider/macros": "1.20.1",
+    "@embroider/macros": "1.20.4",
     "@embroider/test-setup": "4.0.0",
     "@eslint/js": "9.39.3",
     "@glimmer/component": "2.0.0",