- specfile:
* require python >= 3.8
* update required version for setuptools
- update to version 0.38.0:
* Dropped support for Python < 3.7
* Updated vendored "packaging" to 21.3
* Replaced all uses of "distutils" with "setuptools"
* The handling of "license_files" (including glob patterns and
default values) is now delegated to "setuptools>=57.0.0" (#466).
The package dependencies were updated to reflect this change.
* Fixed potential DoS attack via the "WHEEL_INFO_RE" regular
expression
* Fixed "ValueError: ZIP does not support timestamps before 1980"
when using "SOURCE_DATE_EPOCH=0" or when on-disk timestamps are
earlier than 1980-01-01. Such timestamps are now changed to the
minimum value before packaging.

- Also remove the conditional definition of python_module.