Bump paho-mqtt from 1.5.1 to 1.6.1 (#1538)

Bumps [paho-mqtt](https://github.com/eclipse/paho.mqtt.python) from 1.5.1 to 1.6.1.
- [Release notes](https://github.com/eclipse/paho.mqtt.python/releases)
- [Changelog](https://github.com/eclipse/paho.mqtt.python/blob/master/ChangeLog.txt)
- [Commits](https://github.com/eclipse/paho.mqtt.python/compare/v1.5.1...v1.6.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

[skip ci]

requirements.txt

@@ -26,7 +26,7 @@ MarkupSafe==2.0.1
 musicbrainzngs==0.7.1
 oauthlib==3.1.1
 packaging==21.0
-paho-mqtt==1.5.1
+paho-mqtt==1.6.1
 plexapi==4.7.2
 portend==3.0.0
 profilehooks==1.12.0