chore(deps): Bump next from 14.2.15 to 14.2.21

Bumps [next](https://github.com/vercel/next.js) from 14.2.15 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@v14.2.15...v14.2.21)

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

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

Author: dependabot[bot]

examples/next/faustwp-getting-started/package.json

@@ -17,7 +17,7 @@
     "@wordpress/block-library": "^9.10.0",
     "classnames": "^2.5.1",
     "graphql": "^16.8.1",
-    "next": "^14.2.15",
+    "next": "^14.2.21",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "sass": "^1.77.3"