Replace pkg_resources with PEP 420 namespace package

CHANGES.rst

@@ -5,7 +5,7 @@ Changes
 6.1 (unreleased)
 ================
 
-- Nothing changed yet.
+- Replace pkg_resources with PEP 420 namespace package
 
 
 6.0 (2025-03-10)

setup.py

@@ -1,4 +1,3 @@
-from setuptools import find_packages
 from setuptools import setup
 import os.path
 
@@ -38,17 +37,13 @@
         open('CHANGES.rst').read()),
     license="MIT",
     url='https://github.com/gocept/gocept.cache',
-    packages=find_packages('src'),
-    package_dir={'': 'src'},
 
     include_package_data=True,
     zip_safe=False,
 
-    namespace_packages=['gocept'],
     python_requires='>=3.8',
     install_requires=[
         'decorator',
-        'setuptools',
         'transaction',
         'zope.testing',
     ],