[jsk_rqt_plugins] Fix yaml load in tabbed_button_general.py

jsk_rqt_plugins/src/jsk_rqt_plugins/tabbed_button_general.py

@@ -162,7 +162,7 @@ def __init__(self, settings):
             resolved_yaml = resolved_yaml[len("file://"):]
 
         with open(resolved_yaml) as f:
-            yaml_data = yaml.load(f)
+            yaml_data = yaml.safe_load(f)
             self.setupButtons_with_yaml_data(yaml_data=yaml_data, namespace=namespace)
 
         self.show()