chore(deps): bump mqtt from 4.2.1 to 4.2.3 (#615)

Bumps [mqtt](https://github.com/mqttjs/MQTT.js) from 4.2.1 to 4.2.3.
- [Release notes](https://github.com/mqttjs/MQTT.js/releases)
- [Commits](https://github.com/mqttjs/MQTT.js/compare/v4.2.1...v4.2.3)

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package.json

@@ -29,7 +29,7 @@
     "discord-webhook-node": "^1.1.8",
     "dotenv": "^8.2.0",
     "messaging-api-telegram": "^1.0.1",
-    "mqtt": "^4.2.1",
+    "mqtt": "^4.2.3",
     "node-notifier": "^8.0.0",
     "node-pagerduty": "^1.3.4",
     "nodemailer": "^6.4.14",