Update serialport requirement from ^9.2.5 to ^9.2.8
Update serialport requirement from ^9.2.5 to ^9.2.8

Updates the requirements on [serialport](https://github.com/serialport/node-serialport) to permit the latest version.
- [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
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
ioBroker/ioBroker.mysensors,ioBroker/ioBroker.mysensors