chore(deps-dev): bump happy-dom in /apps/intershop

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 14.12.3 to 15.7.4.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](capricorn86/happy-dom@v14.12.3...v15.7.4)

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

Signed-off-by: dependabot[bot] <support@github.com>

apps/intershop/package.json

@@ -44,7 +44,7 @@
     "@types/react": "18.3.9",
     "@types/react-dom": "18.3.0",
     "@vitejs/plugin-react": "^4.3.1",
-    "happy-dom": "^14.12.3",
+    "happy-dom": "^15.7.4",
     "typescript": "5.6.2",
     "vite": "^5.4.8",
     "vitest": "^2.1.1"