- Switch package to modern Python Stack on SLE-15
+ Use Python 3.11 on SLE-15 by default
+ Add Obsoletes for old python3 package on SLE-15
+ 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
+ Update name for dist directory in %files section
- Drop setting default file attributes in %files section (forwarded request 1164936 from glaubitz)