Update package_utils.py (#36972)

Author: msyyc

tools/azure-sdk-tools/packaging_tools/package_utils.py

@@ -34,7 +34,7 @@ def change_log_new(package_folder: str, lastest_pypi_version: bool) -> str:
     except CalledProcessError as e:
         _LOGGER.warning(f"Error ocurred when call breaking change detector: {e.output.decode('utf-8')}")
         raise e
-    _LOGGER.info(f"Breaking change detector output: {result}")
+    _LOGGER.info(f"Breaking change detector output: {output}")
     result = [l for l in output.split("\n")]
     begin = result.index("===== changelog start =====")
     end = result.index("===== changelog end =====")