Bump paho-mqtt from 1.6.1 to 2.1.0

Bumps [paho-mqtt](https://github.com/eclipse/paho.mqtt.python) from 1.6.1 to 2.1.0.
- [Release notes](https://github.com/eclipse/paho.mqtt.python/releases)
- [Changelog](https://github.com/eclipse/paho.mqtt.python/blob/master/ChangeLog.txt)
- [Commits](eclipse-paho/paho.mqtt.python@v1.6.1...v2.1.0)

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

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

Author: dependabot[bot]

poetry.lock

@@ -34,7 +34,7 @@ python = "^3.7.0"
 arrow = ">=0.17,<1.3"
 boto3 = "^1.15.16"
 colorlog = ">=4.4"
-paho-mqtt = "^1.5.1"
+paho-mqtt = ">=1.5.1,<3.0.0"
 ping3 = ">=2.6.6,<5.0.0"
 psutil = "^5.7.2"
 requests = "^2.24.0"