Python 3.12 drops the imp module, and rather than implement a convoluted
replacement for imp.load_source to automatically populate the package version,
we can just add a placeholder and vsed it in the template.

--- ./setup.py.orig	2023-09-29 14:08:21.605034790 -0400
+++ ./setup.py	2023-09-29 14:08:47.085183549 -0400
@@ -22,13 +22,8 @@
 # THE SOFTWARE.
 
 import os
-import imp
 from setuptools import setup
 
-PKG_DIR = 'pathtools'
-version = imp.load_source('version',
-                          os.path.join(PKG_DIR, 'version.py'))
-
 def read_file(filename):
     """
     Reads the contents of a given file relative to the directory
@@ -40,7 +35,7 @@
     return open(os.path.join(os.path.dirname(__file__), filename)).read()
 
 setup(name='pathtools',
-      version=version.VERSION_STRING,
+      version='@@VERSION@@',
       description='File system general utilities',
       long_description=read_file('README'),
       author="Yesudeep Mangalapilly",