NPM: Bump mqtt from 4.3.7 to 5.0.3

Bumps [mqtt](https://github.com/mqttjs/MQTT.js) from 4.3.7 to 5.0.3.
- [Release notes](https://github.com/mqttjs/MQTT.js/releases)
- [Changelog](https://github.com/mqttjs/MQTT.js/blob/main/CHANGELOG.OLD.md)
- [Commits](mqttjs/MQTT.js@v4.3.7...v5.0.3)

---
updated-dependencies:
- dependency-name: mqtt
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -158,7 +158,7 @@
     "eslint-plugin-security": "^1.4.0",
     "eslint-plugin-spellcheck": "0.0.20",
     "i2c-bus": "^5.2.0",
-    "mqtt": "^4.1.0",
+    "mqtt": "^5.0.3",
     "onoff": "^6.0.0"
   }
 }