setup.py: Sphinx version

Author: Ed (ODSC)

setup.py

@@ -47,7 +47,8 @@
             'pytest',
             'sphinxcontrib-applehelp<1.0.1',
             'sphinxcontrib.devhelp<1.0.1',
-            'sphinxcontrib.htmlhelp<1.0.1'
+            'sphinxcontrib.htmlhelp<1.0.1',
+            'sphinx>4.2'
         ],
     },
     namespace_packages=['sphinxcontrib'],