build(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] <support@github.com>

Author: dependabot[bot]

package.json

@@ -106,7 +106,7 @@
     "eventsource": "^4.0.0",
     "express": "4.21.2",
     "globals": "^16.3.0",
-    "happy-dom": "^18.0.1",
+    "happy-dom": "^20.0.0",
     "prettier": "^3.6.2",
     "tslib": "^2.8.1",
     "tsx": "^4.20.3",