chore(deps-dev): Bump happy-dom from 20.3.7 to 20.4.0

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 20.3.7 to 20.4.0.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](capricorn86/happy-dom@v20.3.7...v20.4.0)

---
updated-dependencies:
- dependency-name: happy-dom
  dependency-version: 20.4.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -54,7 +54,7 @@
     "@types/node": "^25.1.0",
     "@vitest/coverage-v8": "^4.0.18",
     "eslint": "^9.29.0",
-    "happy-dom": "^20.3.7",
+    "happy-dom": "^20.4.0",
     "typedoc": "^0.28.16",
     "typescript": "^5.9.3",
     "vitest": "^4.0.7"