- downgrade Sphinx to make the docs test work

docs/requirements.txt

-Sphinx
+# sphinxcontrib_zopeext is not compatible with Sphinx 7
+Sphinx < 7
 # Silence dependabot claiming a security issue in older versions:
 pygments >= 2.7.4
 docutils

setup.py

@@ -68,11 +68,11 @@ setup(
     extras_require={
         'test': tests_require,
         'docs': [
-            'Sphinx',
+            'Sphinx < 7',
             'ZODB',
             'j1m.sphinxautozconfig',
             'sphinx_rtd_theme',
-            'sphinxcontrib_zopeext < 0.4',
+            'sphinxcontrib_zopeext',
         ]
     },
     install_requires=[