Bump electron in /test/integration/with-electron/app

Bumps [electron](https://github.com/electron/electron) from 5.0.0 to 39.8.5.
- [Release notes](https://github.com/electron/electron/releases)
- [Commits](electron/electron@v5.0.0...v39.8.5)

---
updated-dependencies:
- dependency-name: electron
  dependency-version: 39.8.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test/integration/with-electron/app/package.json

@@ -4,7 +4,7 @@
   "main": "index.js",
   "license": "MIT",
   "dependencies": {
-    "electron": "5.0.0",
+    "electron": "39.8.5",
     "spectron": "7.0.0"
   }
 }