- Switch package to modern Python Stack on SLE-15
* Use Python 3.11 on SLE-15 by default
* Drop support for older Python versions
- Switch build system from setuptools to pyproject.toml
* Add python-pip and python-wheel to BuildRequires
* Replace %python_build with %pyproject_wheel
* Replace %python_install with %pyproject_install
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-pysndfile?expand=0&rev=16
