Bump next from 14.2.10 to 14.2.21 (#30)

Bumps [next](https://github.com/vercel/next.js) from 14.2.10 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@v14.2.10...v14.2.21)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "gray-matter": "^4.0.3",
     "hast-util-to-string": "^3.0.0",
     "highlight.js": "^11.10.0",
-    "next": "^14.2.10",
+    "next": "^14.2.21",
     "postcss": "8.4.49",
     "react": "18.3.1",
     "react-dom": "18.2.0",