Bump @testing-library/user-event

Bumps the testing-library group in /extensions/ql-vscode with 1 update: [@testing-library/user-event](https://github.com/testing-library/user-event).


Updates `@testing-library/user-event` from 14.6.7 to 14.6.8
- [Release notes](https://github.com/testing-library/user-event/releases)
- [Changelog](https://github.com/testing-library/user-event/blob/main/CHANGELOG.md)
- [Commits](testing-library/user-event@v14.6.7...v14.6.8)

---
updated-dependencies:
- dependency-name: "@testing-library/user-event"
  dependency-version: 14.6.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: testing-library
...

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

Author: dependabot[bot]

extensions/ql-vscode/package-lock.json

@@ -2122,7 +2122,7 @@
     "@testing-library/dom": "^10.4.2",
     "@testing-library/jest-dom": "^7.0.1",
     "@testing-library/react": "^16.3.3",
-    "@testing-library/user-event": "^14.6.7",
+    "@testing-library/user-event": "^14.6.8",
     "@types/cross-spawn": "^6.0.6",
     "@types/d3-graphviz": "^3.1.0",
     "@types/fs-extra": "^11.0.1",