Update tutorial cu116 -> cu118. (#5638)

notebooks/sparse/graph_transformer.ipynb

@@ -27,7 +27,7 @@
         "# Uncomment below to install required packages. If the CUDA version is not 11.6,\n",
         "# check the https://www.dgl.ai/pages/start.html to find the supported CUDA\n",
         "# version and corresponding command to install DGL.\n",
-        "#!pip install dgl -f https://data.dgl.ai/wheels/cu116/repo.html > /dev/null\n",
+        "#!pip install dgl -f https://data.dgl.ai/wheels/cu118/repo.html > /dev/null\n",
         "#!pip install ogb >/dev/null\n",
         "\n",
         "try:\n",
@@ -38,22 +38,10 @@
         "print(\"DGL installed!\" if installed else \"Failed to install DGL!\")"
       ],
       "metadata": {
-        "colab": {
-          "base_uri": "https://localhost:8080/"
-        },
-        "id": "8wIJZQqODy-7",
-        "outputId": "d9a9400a-e600-4749-b786-2736af35a130"
+        "id": "8wIJZQqODy-7"
       },
       "execution_count": null,
-      "outputs": [
-        {
-          "output_type": "stream",
-          "name": "stdout",
-          "text": [
-            "DGL installed!\n"
-          ]
-        }
-      ]
+      "outputs": []
     },
     {
       "cell_type": "markdown",