Hack to import packaging again.

scripts/python_build_utils.py

@@ -51,18 +51,28 @@ def get_version(package, project, extra_tag='', git_dir=None):
         version = builtin_ver
     return version
 
-def normalize_version(package, project, extra_tag='', git_dir=None):
-    # Pipenv requires setuptools >= 36.2.1. Since 36.2.1, setuptools changed
-    # the way they vendor dependencies, like the packaging module that
-    # provides the way to normalize version numbers for wheel file names. So
-    # we try all the possible ways to find it.
+
+def normalize_version(package, project, extra_tag="", git_dir=None):
+    # We want packaging.Version. packaging is vendored by setuptools,
+    # but it's accessible in different ways depending on the setuptools version.
+    # Try all the possible ways to find it.
+    #
+    # todo(mm, 2024-07-18): We should either cut the packaging dependency or
+    # install packaging explicitly and import it directly.
     try:
-        # new way
-        from setuptools.extern import packaging
+        # setuptools≥71.0.0
+        from setuptools._vendor import packaging
     except ImportError:
-        # old way
-        from pkg_resources.extern import packaging
-    vers_obj = packaging.version.Version(get_version(package, project, extra_tag, git_dir))
+        try:
+            # setuptools≥36.2.1
+            from setuptools.extern import packaging
+        except ImportError:
+            # old way
+            from pkg_resources.extern import packaging
+
+    vers_obj = packaging.version.Version(
+        get_version(package, project, extra_tag, git_dir)
+    )
     return str(vers_obj)
 
 def _latest_tag_for_prefix(prefix, git_dir):