build(deps): bump mqtt from 5.1.3 to 5.1.4

Bumps [mqtt](https://github.com/mqttjs/MQTT.js) from 5.1.3 to 5.1.4.
- [Release notes](https://github.com/mqttjs/MQTT.js/releases)
- [Changelog](https://github.com/mqttjs/MQTT.js/blob/main/CHANGELOG.md)
- [Commits](mqttjs/MQTT.js@v5.1.3...v5.1.4)

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

Signed-off-by: dependabot[bot] <[email protected]>