chore(deps-dev): Bump happy-dom from 18.0.1 to 20.0.0

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 18.0.1 to 20.0.0.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](capricorn86/happy-dom@v18.0.1...v20.0.0)

---
updated-dependencies:
- dependency-name: happy-dom
  dependency-version: 20.0.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

packages/vue-split-panel/package.json

@@ -59,7 +59,7 @@
 		"@vue/test-utils": "2.4.6",
 		"bumpp": "10.2.3",
 		"eslint": "9.33.0",
-		"happy-dom": "18.0.1",
+		"happy-dom": "20.0.0",
 		"tsdown": "0.14.1",
 		"typescript": "5.9.2",
 		"vite": "npm:rolldown-vite@latest",