Add setuptools to requirements

[MatthewScholefield]

When importing the library I consistently see the following stack trace:

Traceback (most recent call last):
  File "/home/matthew/Code/meross-auto-lighting/.venv/bin/meross-auto-lighting", line 5, in <module>
    from meross_auto_lighting import main
  File "/home/matthew/Code/meross-auto-lighting/meross_auto_lighting.py", line 8, in <module>
    from meross_iot.http_api import MerossHttpClient
  File "/home/matthew/Code/meross-auto-lighting/.venv/lib/python3.12/site-packages/meross_iot/http_api.py", line 25, in <module>
    from meross_iot.utilities.misc import current_version
  File "/home/matthew/Code/meross-auto-lighting/.venv/lib/python3.12/site-packages/meross_iot/utilities/misc.py", line 1, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

Modern setuptools provides this import as specified here so I've added it to the package requirements.