chore(deps-dev): bump happy-dom in /tests/envs/svelte3/node18

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 17.6.1 to 20.8.9.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](capricorn86/happy-dom@v17.6.1...v20.8.9)

---
updated-dependencies:
- dependency-name: happy-dom
  dependency-version: 20.8.9
  dependency-type: direct:development
...

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

Author: dependabot[bot]

tests/envs/svelte3/node18/package.json

@@ -13,7 +13,7 @@
     "@testing-library/user-event": "^14.6.1",
     "@vitest/coverage-v8": "0.x.x",
     "expect-type": "^1.2.1",
-    "happy-dom": "17.6.1",
+    "happy-dom": "20.8.9",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
     "jsdom": "^26.1.0",