Bump next from 14.2.3 to 14.2.21

Bumps [next](https://github.com/vercel/next.js) from 14.2.3 to 14.2.21.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v14.2.3...v14.2.21)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
...

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

package.json

@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "lodash.shuffle": "4.2.0",
-    "next": "15.0.3",
+    "next": "14.2.21",
     "react": "18.3.1",
     "react-confetti": "6.1.0",
     "react-dom": "^18"