Bump keytar from 7.4.0 to 7.6.0 in /app

Bumps [keytar](https://github.com/atom/node-keytar) from 7.4.0 to 7.6.0.
- [Release notes](https://github.com/atom/node-keytar/releases)
- [Commits](https://github.com/atom/node-keytar/compare/v7.4.0...v7.6.0)

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

app/package.json

@@ -30,7 +30,7 @@
     "fontmanager-redux": "1.0.0",
     "glasstron": "0.0.7",
     "js-yaml": "4.0.0",
-    "keytar": "^7.4.0",
+    "keytar": "^7.6.0",
     "mz": "^2.7.0",
     "native-process-working-directory": "^1.0.2",
     "ngx-toastr": "^13.2.1",