* m4/python.m4: Add python3.12 and 3.11 as valid interpreters
* m4/ax_python_devel.m4: update to serial 36
* lang/python/Makefile.am: switch from distutils to PEP517 build
* lang/python/setup.py.in: switch from distutils to setuptools
* lang/python/doc/src/gpgme-python-howto.org: replace distutils with setuptools
* lang/python/examples/howto/advanced/cython/setup.py: replace distutils with setuptools
* .gitignore: ignore dist-info