fix(deps): update dependency mqtt to v5.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mqtt	5.8.0 -> 5.8.1

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Release Notes

mqttjs/MQTT.js (mqtt)

### [`v5.8.1`](https://togithub.com/mqttjs/MQTT.js/blob/HEAD/CHANGELOG.md#581-2024-07-18) [Compare Source](https://togithub.com/mqttjs/MQTT.js/compare/v5.8.0...v5.8.1) ##### Bug Fixes - connect after client.end not working ([#​1902](https://togithub.com/mqttjs/MQTT.js/issues/1902)) ([fbe5294](https://togithub.com/mqttjs/MQTT.js/commit/fbe52949b47378768fd325f01682a766a5965dfe)) - reschedule pings problem ([#​1904](https://togithub.com/mqttjs/MQTT.js/issues/1904)) ([8e14d3e](https://togithub.com/mqttjs/MQTT.js/commit/8e14d3eac01f4fcccfc1ee657e0158d0644951ce))

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