Bump rumqttc from c03ba8b to 2167da0 in /scylla-server

Bumps [rumqttc](https://github.com/bytebeamio/rumqtt) from `c03ba8b` to `2167da0`.
- [Release notes](https://github.com/bytebeamio/rumqtt/releases)
- [Commits](bytebeamio/rumqtt@c03ba8b...2167da0)

---
updated-dependencies:
- dependency-name: rumqttc
  dependency-version: 2167da05a66137cf4933ab7b2aba8b205671f58b
  dependency-type: direct:production
...

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Author: dependabot[bot]