Update VS Code test to fix upstream regression (#14781)

Author: DonJayamanne

package-lock.json

@@ -2390,7 +2390,7 @@
         "@typescript-eslint/eslint-plugin-tslint": "^6.9.0",
         "@typescript-eslint/parser": "^6.9.0",
         "@vscode/dts": "^0.4.0",
-        "@vscode/test-electron": "^2.3.4",
+        "@vscode/test-electron": "^2.3.8",
         "@vscode/test-web": "^0.0.44",
         "@vscode/zeromq": "^0.2.0",
         "acorn": "^8.9.0",