Replace deprecated API in NSL tutorials when checking for GPU availability.

PiperOrigin-RevId: 306457313

Author: arjung

g3doc/tutorials/graph_keras_lstm_imdb.ipynb

@@ -182,7 +182,9 @@
         "print(\"Version: \", tf.__version__)\n",
         "print(\"Eager mode: \", tf.executing_eagerly())\n",
         "print(\"Hub version: \", hub.__version__)\n",
-        "print(\"GPU is\", \"available\" if tf.test.is_gpu_available() else \"NOT AVAILABLE\")"
+        "print(\n",
+        "    \"GPU is\",\n",
+        "    \"available\" if tf.config.list_physical_devices(\"GPU\") else \"NOT AVAILABLE\")"
       ]
     },
     {

g3doc/tutorials/graph_keras_mlp_cora.ipynb

@@ -174,7 +174,9 @@
         "\n",
         "print(\"Version: \", tf.__version__)\n",
         "print(\"Eager mode: \", tf.executing_eagerly())\n",
-        "print(\"GPU is\", \"available\" if tf.test.is_gpu_available() else \"NOT AVAILABLE\")"
+        "print(\n",
+        "    \"GPU is\",\n",
+        "    \"available\" if tf.config.list_physical_devices(\"GPU\") else \"NOT AVAILABLE\")"
       ]
     },
     {