Bump happy-dom from 20.8.4 to 20.8.8 in /nifi-frontend/src/main/frontend

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 20.8.4 to 20.8.8.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](capricorn86/happy-dom@v20.8.4...v20.8.8)

---
updated-dependencies:
- dependency-name: happy-dom
  dependency-version: 20.8.8
  dependency-type: direct:development
...

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

Author: dependabot[bot]

nifi-frontend/src/main/frontend/package-lock.json

@@ -88,7 +88,7 @@
         "eslint": "8.57.0",
         "eslint-config-prettier": "10.1.1",
         "eslint-plugin-prettier": "^5.0.1",
-        "happy-dom": "^20.0.2",
+        "happy-dom": "^20.8.8",
         "jest": "30.3.0",
         "jest-preset-angular": "16.0.0",
         "ng-mocks": "^14.12.2",