feat(pkginfo): upgrade pytz to ">=2020.5.0,<2020.6.0"

cubicweb_saem_ref/__pkginfo__.py

@@ -28,7 +28,7 @@ __depends__ = {
     'cubicweb-signedrequest': ">=1.0.0,<1.1.0",
     'isodate': None,
     'python-dateutil': None,
-    'pytz': None,
+    'pytz': ">=2020.5.0,<2020.6.0",
     'psycopg2': ">=2.8.0,<2.9.0",
     'rdflib': ">=5.0.0,<5.1.0",
 }