Bump electron from 9.1.2 to 9.3.1 in /e2e/tests

Bumps [electron](https://github.com/electron/electron) from 9.1.2 to 9.3.1.
- [Release notes](https://github.com/electron/electron/releases)
- [Changelog](https://github.com/electron/electron/blob/master/docs/breaking-changes.md)
- [Commits](electron/electron@v9.1.2...v9.3.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

e2e/tests/package-lock.json

@@ -22,7 +22,7 @@
   },
   "homepage": "https://github.com/nut-tree/nut.js#readme",
   "devDependencies": {
-    "electron": "9.1.2",
+    "electron": "9.3.1",
     "jest": "26.2.2",
     "lerna": "3.22.1",
     "spectron": "11.1.0",