Use tempfile.mkstemp instead of tempfile.mktemp.

The `tempfile.mktemp` function is [deprecated](https://docs.python.org/3/library/tempfile.html#tempfile.mktemp) due to [security issues](https://cwe.mitre.org/data/definitions/377.html).

The switch is easy to do.

PiperOrigin-RevId: 420384092
Change-Id: I8721c09ccc4de589b5a45d38e7ebc440160c72b8

tensorflow/python/debug/wrappers/local_cli_wrapper.py

@@ -80,7 +80,7 @@ def __init__(self,
         self, sess, thread_name_filter=thread_name_filter)
 
     if not dump_root:
-      self._dump_root = tempfile.mktemp(prefix=_DUMP_ROOT_PREFIX)
+      self._dump_root = tempfile.mkdtemp(prefix=_DUMP_ROOT_PREFIX)
     else:
       dump_root = os.path.expanduser(dump_root)
       if os.path.isfile(dump_root):