Fix tests for Python 3.12

`distutils' have been removed from Python stdlib (nipy#1240).

nisext/sexts.py

@@ -2,10 +2,10 @@
 
 import os
 from configparser import ConfigParser
-from distutils import log
-from distutils.command.build_py import build_py
-from distutils.command.install_scripts import install_scripts
-from distutils.version import LooseVersion
+import logging as log
+from setuptools.command.build_py import build_py
+from setuptools.command.install_scripts import install_scripts
+from looseversion import LooseVersion
 from os.path import join as pjoin
 from os.path import split as psplit
 from os.path import splitext
@@ -121,7 +121,7 @@ def package_check(
        giving the feature name for the ``extras_require`` argument to setup.
     checker : callable, optional
        callable with which to return comparable thing from version
-       string.  Default is ``distutils.version.LooseVersion``
+       string.  Default is ``setuptools.version.LooseVersion``
     version_getter : {None, callable}:
        Callable that takes `pkg_name` as argument, and returns the
        package version string - as in::

pyproject.toml

@@ -71,6 +71,7 @@ test = [
   "pytest-doctestplus",
   "pytest-httpserver",
   "pytest-xdist",
+  "looseversion",
 ]
 typing = [
   "mypy",