chore(deps): update devdependency happy-dom to v20 (v2) (#5216)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -72,7 +72,7 @@
     "@release-it/conventional-changelog": "^10.0.1",
     "@vue/test-utils": "^2.4.6",
     "eslint": "^9.37.0",
-    "happy-dom": "^19.0.2",
+    "happy-dom": "^20.0.0",
     "nuxt": "^4.1.2",
     "release-it": "^19.0.5",
     "typescript": "^5.8.3",