fix: use yaml.safe_dump

Author: tomplus

Diff for: config/kube_config_test.py

@@ -1105,7 +1105,7 @@ def _create_mulit_config(self):
                 self.TEST_KUBE_CONFIG_PART1,
                 self.TEST_KUBE_CONFIG_PART2,
                 self.TEST_KUBE_CONFIG_PART3):
-            files.append(self._create_temp_file(yaml.dump(part)))
+            files.append(self._create_temp_file(yaml.safe_dump(part)))
         return ENV_KUBECONFIG_PATH_SEPARATOR.join(files)
 
     def test_list_kube_config_contexts(self):