chore(deps-dev): bump mqtt from 5.3.6 to 5.4.0

Bumps [mqtt](https://github.com/mqttjs/MQTT.js) from 5.3.6 to 5.4.0.
- [Release notes](https://github.com/mqttjs/MQTT.js/releases)
- [Changelog](https://github.com/mqttjs/MQTT.js/blob/main/CHANGELOG.md)
- [Commits](mqttjs/MQTT.js@v5.3.6...v5.4.0)

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

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

package.json

@@ -154,7 +154,7 @@
     "merge-graphql-schemas": "1.7.8",
     "mocha": "10.3.0",
     "mongoose": "8.2.1",
-    "mqtt": "5.3.6",
+    "mqtt": "5.4.0",
     "multer": "1.4.4",
     "mysql2": "3.9.2",
     "nats": "2.19.0",