Use tempfile.mkdtemp instead of tempfile.mktemp to create directo…

…ries.

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: just a name change

PiperOrigin-RevId: 420370858
Change-Id: I44a0849d161132eacd4f3881fdb615e09c0f02a2

tensorflow/python/debug/lib/debug_data_test.py

@@ -147,8 +147,7 @@ def testDumpSizeBytesIsNoneForNonexistentFilePath(self):
 class DebugDumpDirTest(test_util.TensorFlowTestCase):
 
   def setUp(self):
-    self._dump_root = tempfile.mktemp()
-    os.mkdir(self._dump_root)
+    self._dump_root = tempfile.mkdtemp()
 
   def tearDown(self):
     # Tear down temporary dump directory.
@@ -179,7 +178,7 @@ def _makeDataDirWithMultipleDevicesAndDuplicateNodeNames(self):
 
   def testDebugDumpDir_nonexistentDumpRoot(self):
     with self.assertRaisesRegex(IOError, "does not exist"):
-      debug_data.DebugDumpDir(tempfile.mktemp() + "_foo")
+      debug_data.DebugDumpDir(tempfile.mkdtemp() + "_foo")
 
   def testDebugDumpDir_invalidFileNamingPattern(self):
     # File name with too few underscores should lead to an exception.