suppress the warnings where we check for sensitive values

#44061 (comment)

Author: zachliu

airflow/configuration.py

@@ -777,7 +777,8 @@ def mask_secrets(self):
 
         for section, key in self.sensitive_config_values:
             try:
-                value = self.get(section, key, suppress_warnings=True)
+                with self.suppress_future_warnings():
+                    value = self.get(section, key, suppress_warnings=True)
             except AirflowConfigException:
                 log.debug(
                     "Could not retrieve value from section %s, for key %s. Skipping redaction of this conf.",