- Update sphinx-update-removed-function.patch patch to the latest
version in python36.
- Last try before this results in an editwar:
* remove importlib_resources and importlib-metadata
provides/obsoletes
* import importlib_resources is not the same as
import importlib.resources, same for metadata
* The backport packages from PyPI needed for older flavors are
specified as such for setuptools or in pyproject.toml. If a
package requires them they typically add them with a python
version qualifier and the packages have their own version
numbers.