Update to python 3.12

[kilmanio]

SafeConfigParser was renamed to ConfigParser (docs)

.readfp() was renamed to .read_file() (docs)

Otherwise trying to run the client with python 3.12 gets you this nice error

> python syncplayClient.py
Traceback (most recent call last):
  File "[]/syncplay/syncplayClient.py", line 14, in <module>
    from syncplay import ep_client
  File "[]/syncplay/syncplay/ep_client.py", line 3, in <module>
    from syncplay.clientManager import SyncplayClientManager
  File "[]/syncplay/clientManager.py", line 4, in <module>
    from syncplay.ui.ConfigurationGetter import ConfigurationGetter
  File "/usr/lib/python3.12/site-packages/shiboken2/files.dir/shibokensupport/feature.py", line 139, in _import
    return original_import(name, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "[]/syncplay/syncplay/ui/ConfigurationGetter.py", line 8, in <module>
    from configparser import SafeConfigParser, DEFAULTSECT
ImportError: cannot import name 'SafeConfigParser' from 'configparser' (/usr/lib/python3.12/configparser.py). Did you mean: 'RawConfigParser'?

[Et0h]

Thanks for this commit to improve Syncplay compatibility.

You didn't specify impact on earlier versions of Python, but I had a check and readfp being used instead of read_file seems to date back to Python 3.2. As the earliest supported version of Python that is still being supported is 3.8 this seems not to be an issue.