Fix the build with setuptools >= 71

The `pkg_resources` module no longer bundles a vendored version of the
`packaging` module. Add an explicit dependency on `packaging` and
directly use its classes.

Change-Id: I9362ca6d6323b56bc579db30e7f5bb40b57da65a

jenkins_jobs/registry.py

@@ -18,10 +18,10 @@
 import inspect
 import logging
 import operator
+import packaging.version
 import pkg_resources
 import sys
 import types
-from pkg_resources.extern.packaging.version import InvalidVersion
 
 from six import PY2
 
@@ -76,8 +76,8 @@ class ModuleRegistry(object):
                 version = plugin_info["version"]
 
             try:
-                pkg_resources.parse_version(version)
-            except InvalidVersion:
+                packaging.version.Version(version)
+            except packaging.version.InvalidVersion:
                 plugin_name = short_name or long_name
                 if plugin_name:
                     logger.warning(

requirements.txt

@@ -9,5 +9,5 @@ stevedore>=1.17.1; python_version >= '3.0'  # Apache-2.0
 python-jenkins>=1.8.2
 fasteners
 Jinja2
-setuptools==69.5.1; python_version >= '3.8'
-setuptools; python_version < '3.8'
+packaging
+setuptools