Bump next from 14.2.18 to 15.1.5

Bumps [next](https://github.com/vercel/next.js) from 14.2.18 to 15.1.5.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.2.18...v15.1.5)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -40,7 +40,7 @@
     "formik": "2.4.5",
     "framer-motion": "11.11.17",
     "ky": "1.3.0",
-    "next": "14.2.18",
+    "next": "15.1.5",
     "react": "18.3.1",
     "react-datepicker": "6.9.0",
     "react-dom": "18.3.1",