feat(pkginfo): upgrade rdflib to ">=5.0.0,<5.1.0"

cubicweb_saem_ref/__pkginfo__.py

@@ -30,7 +30,7 @@ __depends__ = {
     'python-dateutil': None,
     'pytz': None,
     'psycopg2': '< 2.8',
-    'rdflib': '>= 4.1',
+    'rdflib': ">=5.0.0,<5.1.0",
 }
 __recommends__ = {}