resolve more linting errors

test/workflows/site/test_modify_site.py

@@ -39,6 +39,5 @@ def test_modify_site_with_invalid_data(responses, site_subscription_factory):
         },
     ]
 
-    with pytest.raises(FormValidationError) as e:
+    with pytest.raises(FormValidationError, match="site_bgp_community_id must be unique"):
         run_workflow("modify_site", initial_site_data)
-        assert "site_bgp_community_id must be unique" in str(e.value)