chore(deps): update devdependency happy-dom to v18

Author: renovate[bot]

package.json

@@ -60,7 +60,7 @@
     "@nuxt/module-builder": "^1.0.1",
     "@nuxt/test-utils": "^3.17.1",
     "eslint": "^9.21.0",
-    "happy-dom": "^17.4.7",
+    "happy-dom": "^18.0.1",
     "nuxt": "^3.17.2",
     "typescript": "^5.8.3",
     "vitest": "^3.1.3",