Use setup.cfg to specify test dependency on packaging

Author: abravalheri

setup.cfg

@@ -59,6 +59,7 @@ testing =
 	virtualenv>=13.0.0
 	wheel
 	pip>=19.1 # For proper file:// URLs support.
+	packaging>=23.2
 	jaraco.envs>=2.2
 	pytest-xdist
 	jaraco.path>=3.2.0

tox.ini

@@ -2,7 +2,6 @@
 description = perform primary checks (tests, style, types, coverage)
 deps =
 	# Ideally all the dependencies should be set as "extras"
-	packaging >= 23.2
 setenv =
 	PYTHONWARNDEFAULTENCODING = 1
 	SETUPTOOLS_ENFORCE_DEPRECATION = {env:SETUPTOOLS_ENFORCE_DEPRECATION:0}