pip install deprecation warning

[andypiper]

Hello from a member of the original Paho team 🙂 thanks for continuing the great work!

On macOS Ventura, Python 3.11, pip 23.0

 DEPRECATION: paho-mqtt is being installed using the legacy 'setup.py install' method, because 
it does not have a 'pyproject.toml' and the 'wheel' package is not installed. pip 23.1 will 
enforce this behaviour change. A possible replacement is to enable the '--use-pep517' option. 
Discussion can be found at https://github.com/pypa/pip/issues/8559
  Running setup.py install for paho-mqtt ... done

There are workarounds listed (and the installation works and the library is fine), but Paho probably needs to be updated for the new pyproject.toml library metadata format.

[semuadmin]

Great library, but same issue here. Any timeline on pyproject.toml support?

I've submitted a PR which endeavours to address this: #712

[MattBrittan]

I believe PR #774 (now committed) addresses this; would appreciate it if someone could confirm.