Python 3.12 support

[enkore]

Some guts cython meddles with changed, so this needs at least a re-cythonize with cython 0.xx, or possibly a port to cython 3.

[kossakmarcin]

There is problem with installation on the python 3.12.1

issue:
File "/tmp/pip-install-ef0gft19/ssh2-python_55c50b210f2c473a9b2bfb882b0a4743/versioneer.py", line 342, in get_config_from_root
parser = configparser.SafeConfigParser()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'configparser' has no attribute 'SafeConfigParser'. Did you mean: 'RawConfigParser'?
[end of output]

[pkittenis]

Resolved in latest changes.