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: 420359138
Change-Id: I8afc97448b1e730ac5883c2033f3b0e544b8fb58

tensorflow/python/debug/examples/v1/debug_keras.py

@@ -40,9 +40,11 @@ def main(_):
   sess = tf.Session()
   if FLAGS.debug:
     # Use the command-line interface (CLI) of tfdbg.
-    config_file_path = (
-        tempfile.mktemp(".tfdbg_config")
-        if FLAGS.use_random_config_path else None)
+    if FLAGS.use_random_config_path:
+      # TODO(mihaimaruseac): Safe to ignore fd here?
+      _, config_file_path = tempfile.mkstemp(".tfdbg_config")
+    else:
+      config_file_path = None
     sess = tf_debug.LocalCLIDebugWrapperSession(
         sess, ui_type=FLAGS.ui_type, config_file_path=config_file_path)
   elif FLAGS.tensorboard_debug_address: