add Vertex_AI llm credentials sensitive keywords "vertex_credentials" (#19551)

* add Vertex_AI  llm credentials sensitive keywords "vertex_credentials"

* Update test_litellm_logging.py add test case

litellm/litellm_core_utils/litellm_logging.py

@@ -3296,6 +3296,7 @@ def _get_masked_values(
         "token",
         "key",
         "secret",
+        "vertex_credentials",
     ]
     return {
         k: (

tests/test_litellm/litellm_core_utils/test_litellm_logging.py

@@ -787,11 +787,13 @@ def test_get_masked_values():
         "presidio_ad_hoc_recognizers": None,
         "aws_bedrock_runtime_endpoint": None,
         "presidio_anonymizer_api_base": None,
+        "vertex_credentials": "{sensitive_api_key}",
     }
     masked_values = _get_masked_values(
         sensitive_object, unmasked_length=4, number_of_asterisks=4
     )
     assert masked_values["presidio_anonymizer_api_base"] is None
+    assert masked_values["vertex_credentials"] == "{s****y}"
 
 
 @pytest.mark.asyncio