Bump next from 15.5.9 to 16.1.5

Bumps [next](https://github.com/vercel/next.js) from 15.5.9 to 16.1.5.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.9...v16.1.5)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.1.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -44,7 +44,7 @@
 		"luxon": "^3.7.2",
 		"markdown-it": "^13.0.2",
 		"mdast-util-toc": "^7.1.0",
-		"next": "^15.5.9",
+		"next": "^16.1.5",
 		"npm-watch": "^0.13.0",
 		"react": "^19.2.3",
 		"react-dom": "^19.2.3",