Add workaround for sphinx errors

Author: abravalheri

setup.cfg

@@ -92,7 +92,7 @@ testing-integration =
 
 docs =
 	# upstream
-	sphinx >= 3.5
+	sphinx >= 3.5,<=7.1.2  # workaround, see comments in pypa/setuptools#4020
 	jaraco.packaging >= 9.3
 	rst.linker >= 1.9
 	furo