Bump mqtt from 4.1.0 to 4.2.0
Bump mqtt from 4.1.0 to 4.2.0

Bumps [mqtt](https://github.com/mqttjs/MQTT.js) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/mqttjs/MQTT.js/releases)
- [Commits](https://github.com/mqttjs/MQTT.js/compare/v4.1.0...v4.2.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
KhaosT/homebridge-camera-ffmpeg