Update tutorial cu116 -> cu118. (#5633)

notebooks/sparse/quickstart.ipynb

@@ -14,7 +14,8 @@
     "language_info": {
       "name": "python"
     },
-    "gpuClass": "standard"
+    "gpuClass": "standard",
+    "accelerator": "GPU"
   },
   "cells": [
     {
@@ -43,7 +44,7 @@
         "# 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",
         "\n",
         "try:\n",
         "    import dgl.sparse as dglsp\n",