Bump next from 5.1.0 to 9.3.2 in /tutorials/4-end

Bumps [next](https://github.com/zeit/next.js) from 5.1.0 to 9.3.2.
- [Release notes](https://github.com/zeit/next.js/releases)
- [Commits](vercel/next.js@5.1.0...v9.3.2)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tutorials/4-end/package.json

@@ -14,7 +14,7 @@
     "babel-cli": "^6.26.0",
     "express": "^4.16.2",
     "material-ui": "1.0.0-beta.41",
-    "next": "^5.1.0",
+    "next": "^9.3.2",
     "prop-types": "^15.6.1",
     "react": "^16.2.0",
     "react-dom": "^16.2.0",