Bump aiomqtt from 2.3.2 to 2.4.0 (#298)

Bumps [aiomqtt](https://github.com/empicano/aiomqtt) from 2.3.2 to 2.4.0.
- [Release notes](https://github.com/empicano/aiomqtt/releases)
- [Changelog](https://github.com/empicano/aiomqtt/blob/main/CHANGELOG.md)
- [Commits](empicano/aiomqtt@v2.3.2...v2.4.0)

---
updated-dependencies:
- dependency-name: aiomqtt
  dependency-version: 2.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]