chore(deps): bump next from 14.2.35 to 15.5.18

Bumps [next](https://github.com/vercel/next.js) from 14.2.35 to 15.5.18.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.35...v15.5.18)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.18
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -23,7 +23,7 @@
     "i18next": "^23.16.8",
     "i18next-browser-languagedetector": "^7.2.2",
     "misans": "^4.1.0",
-    "next": "14.2.35",
+    "next": "15.5.18",
     "next-sitemap": "^4.2.3",
     "react": "18.3.1",
     "react-dom": "18.3.1",