Unpin paho-mqtt version

[kruton]

The new update to paho-mqtt, version 2.1.0, fixed the backward incompatible callback signature problem by defaulting the callback type to paho-mqtt V1 style callbacks. This means that packages can upgrade to paho-mqtt 2.1.0 or leave it at <2.0.0 without any software changes.

Description:

Related issue (if applicable): #1065 (original issue where they pinned)

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Modify dockerfile to include paho-mqtt
perl -pi -e 's,^(RUN pip.*requirements.txt$),COPY all-plugin-requirements.txt /\n\1 -r /all-plugin-requirements.txt,g' test/docker/Dockerfile.py311

# Build the container
docker compose build test.py311

# Run MQTT tests
docker compose run --rm test.py311 bin/test.sh mqtt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.36%. Comparing base (01c1082) to head (52dc316).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1238   +/-   ##
=======================================
  Coverage   99.36%   99.36%           
=======================================
  Files         147      147           
  Lines       20555    20555           
  Branches     3663     3663           
=======================================
  Hits        20425    20425           
  Misses        121      121           
  Partials        9        9           

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[caronc]

Thank you! 🙏