chore(deps): update devdependency happy-dom to v20

Author: renovate[bot]

package.json

@@ -41,7 +41,7 @@
     "@playwright/test": "1.52.0",
     "@vue/test-utils": "2.4.6",
     "eslint": "9.35.0",
-    "happy-dom": "18.0.1",
+    "happy-dom": "20.0.8",
     "lint-staged": "16.1.0",
     "simple-git-hooks": "2.13.0",
     "typescript": "5.8.3",