chore(deps): update dependency @embroider/addon-dev to v8

Author: renovate[bot]

packages/ember-simple-auth/package.json

@@ -40,7 +40,7 @@
     "@babel/plugin-proposal-class-properties": "7.18.6",
     "@babel/plugin-proposal-decorators": "7.25.9",
     "@babel/runtime": "7.27.0",
-    "@embroider/addon-dev": "7.1.3",
+    "@embroider/addon-dev": "8.1.0",
     "@glint/core": "1.5.2",
     "@glint/environment-ember-loose": "1.5.2",
     "@glint/environment-ember-template-imports": "1.5.2",