Winkerberos

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- Add support for Python 3.12. Drop support for Python versions 2.7, 3.5, and 3.6.

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- Add support for Python 3.11.

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- Fix build in mingw-w64: ``MINGW_CHOST`` is specific to msys2 build and
packaging environment. Instead, check ``sys.version`` which is available in
any python env. Also remove ``SecPkgContext_Bindings`` definition which has
been added in ``mingw-w64`` headers.
- Allow ``channel_bindings=None`` for ``authGSSClientStep``.
- WinKerberos now requires Python 2.7 or 3.5+.

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- WinKerberos now builds under MSYS2 using mingw-w64. Note
that you can't use this support to build with python.org
provided Pythons and mingw-w64. See `<https://bugs.python.org/issue25251>`_
for a related discussion. Thanks go to Antoine Martin for the patch.
- Experimental server side API. Thanks go to Kacper Bostrom for the patch.

*Backward Breaking Changes*

- ``authGSSClientUsername`` has been renamed
:func:`winkerberos.authGSSClientUserName` to match ccs-pykerberos.
- WinKerberos no longer supports Python 2.6 or Python 3.3.

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- Added optional support for passing in Channel Binding Tokens (RFC 5929) into
:func:`winkerberos.authGSSClientStep`. The binding token structure can be
built using :func:`winkerberos.channelBindings` (see the example
for more details). Thanks go to Jordan Borean for the patch.

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- Added the ``mech_oid`` parameter to :func:`~winkerberos.authGSSClientInit`.
Thanks go to Alexey Veklov for the patch.