Bump vscode-test from 1.3.0 to 1.4.0 (#2738)

Bumps [vscode-test](https://github.com/Microsoft/vscode-test) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/Microsoft/vscode-test/releases)
- [Changelog](https://github.com/microsoft/vscode-test/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Microsoft/vscode-test/commits)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -67,7 +67,7 @@
     "tslint": "~6.1.2",
     "typescript": "~3.9.3",
     "vsce": "~1.75.0",
-    "vscode-test": "~1.3.0"
+    "vscode-test": "~1.4.0"
   },
   "extensionDependencies": [
     "vscode.powershell"