deps: update to electron 16

Contains:

- Chromium 91 -> 96, including multiple webrtc and security fixes
- Linux file chooser portal fixes (https://github.com/electron/electron/pull/19159)

Closes: #629

package.json

@@ -160,7 +160,7 @@
     "babel-loader": "8.1.0",
     "concurrently": "5.1.0",
     "css-loader": "3.5.0",
-    "electron": "13.5.2",
+    "electron": "16.0.3",
     "electron-builder": "22.11.11",
     "electron-context-menu": "^2.5.0",
     "electron-is-dev": "^1.2.0",