Bump the npm_and_yarn group across 2 directories with 1 update

Bumps the npm_and_yarn group with 1 update in the / directory: [next](https://github.com/vercel/next.js).
Bumps the npm_and_yarn group with 1 update in the /examples/react-nextjs directory: [next](https://github.com/vercel/next.js).


Updates `next` from 14.2.18 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](vercel/next.js@v14.2.18...v14.2.21)

Updates `next` from 14.2.18 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](vercel/next.js@v14.2.18...v14.2.21)

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

Signed-off-by: dependabot[bot] <[email protected]>

examples/react-nextjs/package.json

@@ -19,7 +19,7 @@
   },
   "dependencies": {
     "@quiltt/react": "workspace:*",
-    "next": "14.2.18",
+    "next": "14.2.21",
     "react": "18.3.1",
     "react-dom": "18.3.1"
   },