Bump @testing-library/jest-dom in /ui/extensions/hello (#39)

Bumps [@testing-library/jest-dom](https://github.com/testing-library/jest-dom) from 6.7.0 to 6.8.0.
- [Release notes](https://github.com/testing-library/jest-dom/releases)
- [Changelog](https://github.com/testing-library/jest-dom/blob/main/CHANGELOG.md)
- [Commits](testing-library/jest-dom@v6.7.0...v6.8.0)

---
updated-dependencies:
- dependency-name: "@testing-library/jest-dom"
  dependency-version: 6.8.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

ui/extensions/hello/package-lock.json

@@ -30,7 +30,7 @@
     "@rollup/plugin-json": "6.1.0",
     "@rollup/plugin-node-resolve": "16.0.1",
     "@rollup/plugin-replace": "6.0.2",
-    "@testing-library/jest-dom": "^6.7.0",
+    "@testing-library/jest-dom": "^6.8.0",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
     "@web/rollup-plugin-html": "2.3.0",