Bump @vscode/test-electron from 2.3.8 to 2.3.9 in /extensions/ql-vscode

Bumps [@vscode/test-electron](https://github.com/Microsoft/vscode-test) from 2.3.8 to 2.3.9.
- [Changelog](https://github.com/microsoft/vscode-test/blob/main/CHANGELOG.md)
- [Commits](https://github.com/Microsoft/vscode-test/commits/v2.3.9)

---
updated-dependencies:
- dependency-name: "@vscode/test-electron"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

extensions/ql-vscode/package-lock.json

@@ -2023,7 +2023,7 @@
     "@types/yauzl": "^2.10.3",
     "@typescript-eslint/eslint-plugin": "^6.19.0",
     "@typescript-eslint/parser": "^6.21.0",
-    "@vscode/test-electron": "^2.2.0",
+    "@vscode/test-electron": "^2.3.9",
     "@vscode/vsce": "^2.19.0",
     "ansi-colors": "^4.1.1",
     "applicationinsights": "^2.9.4",