chore(deps): bump mqtt from 5.5.0 to 5.7.3

Bumps [mqtt](https://github.com/mqttjs/MQTT.js) from 5.5.0 to 5.7.3.
- [Release notes](https://github.com/mqttjs/MQTT.js/releases)
- [Changelog](https://github.com/mqttjs/MQTT.js/blob/main/CHANGELOG.md)
- [Commits](mqttjs/MQTT.js@v5.5.0...v5.7.3)

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

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

Author: dependabot[bot]

package-lock.json

@@ -38,6 +38,6 @@
     },
     "dependencies": {
         "nodecg-io-core": "^0.3.0",
-        "mqtt": "^5.5.0"
+        "mqtt": "^5.7.3"
     }
 }