Bump keytar from 4.11.0 to 4.12.0 in /app

Bumps [keytar](https://github.com/atom/node-keytar) from 4.11.0 to 4.12.0.
- [Release notes](https://github.com/atom/node-keytar/releases)
- [Commits](https://github.com/atom/node-keytar/compare/v4.11.0...v4.12.0)

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

app/package.json

@@ -28,7 +28,7 @@
     "electron-is-dev": "1.1.0",
     "electron-updater": "^4.0.6",
     "js-yaml": "3.13.1",
-    "keytar": "^4.7.0",
+    "keytar": "^4.12.0",
     "mz": "^2.7.0",
     "ngx-toastr": "^10.0.4",
     "node-pty": "^0.9.0-beta19",