Update @iobroker/testing requirement from ^2.5.2 to ^2.5.4
Update @iobroker/testing requirement from ^2.5.2 to ^2.5.4

Updates the requirements on [@iobroker/testing](https://github.com/AlCalzone/testing) to permit the latest version.
- [Release notes](https://github.com/AlCalzone/testing/releases)
- [Changelog](https://github.com/ioBroker/testing/blob/master/CHANGELOG.md)
- [Commits](https://github.com/AlCalzone/testing/compare/v2.5.2...v2.5.4)

---
updated-dependencies:
- dependency-name: "@iobroker/testing"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Pmant/ioBroker.mqtt-client,Pmant/ioBroker.mqtt-client