feat(setup.py): increase cubicweb max version to 3.31.x

__pkginfo__.py

@@ -20,7 +20,7 @@ classifiers = [
 ]
 
 # used packages
-__depends__ = {'cubicweb': '>= 3.20.0',
+__depends__ = {'cubicweb': ">= 3.20.0, < 3.32.0",
                'cubicweb-file': '>= 1.9.0',
                'logilab-common': '>= 0.58.3',
                'cwclientlib': '>= 0.3.1',