Bump serialport from 9.2.5 to 9.2.8 in /app

Bumps [serialport](https://github.com/serialport/node-serialport) from 9.2.5 to 9.2.8.
- [Release notes](https://github.com/serialport/node-serialport/releases)
- [Changelog](https://github.com/serialport/node-serialport/blob/master/CHANGELOG.md)
- [Commits](https://github.com/serialport/node-serialport/compare/@serialport/bindings@9.2.5...@serialport/bindings@9.2.8)

---
updated-dependencies:
- dependency-name: serialport
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

app/package.json

@@ -36,7 +36,7 @@
   },
   "optionalDependencies": {
     "macos-native-processlist": "^2.0.0",
-    "serialport": "^9.2.5",
+    "serialport": "^9.2.8",
     "windows-blurbehind": "^1.0.1",
     "windows-native-registry": "^3.1.0",
     "windows-process-tree": "^0.3.2"