Update React version in Tailwind example (#21906)

This PR updates the React packages version in the example with Tailwind.
Thus solving the new version notice when starting the project in dev.

Notice screenshot: 📸 
![image](https://user-images.githubusercontent.com/25041169/107084102-5bc0f780-67d5-11eb-82bb-b9ea2682ec5c.png)

Now with the updated version:📸 
![image](https://user-images.githubusercontent.com/25041169/107084154-71ceb800-67d5-11eb-95c9-54ea534145dd.png)

examples/with-tailwindcss/package.json

@@ -9,8 +9,8 @@
   },
   "dependencies": {
     "next": "latest",
-    "react": "^16.13.1",
-    "react-dom": "^16.13.1",
+    "react": "^17.0.1",
+    "react-dom": "^17.0.1",
     "autoprefixer": "^10.0.4",
     "postcss": "^8.1.10",
     "tailwindcss": "^2.0.2"