chore(deps): bump happy-dom from 16.8.1 to 20.0.2 in /packages/backend

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 16.8.1 to 20.0.2.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](https://github.com/capricorn86/happy-dom/compare/v16.8.1...v20.0.2)

---
updated-dependencies:
- dependency-name: happy-dom
  dependency-version: 20.0.2
  dependency-type: direct:production
...

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

packages/backend/package.json

@@ -121,7 +121,7 @@
 		"fluent-ffmpeg": "2.1.3",
 		"form-data": "4.0.4",
 		"got": "14.4.9",
-		"happy-dom": "16.8.1",
+		"happy-dom": "20.0.2",
 		"hpagent": "1.2.0",
 		"htmlescape": "1.1.1",
 		"http-link-header": "1.1.3",