feat(deps): Bump next

Bumps [next](https://github.com/vercel/next.js) from 15.5.15 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@v15.5.15...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]

dev-packages/e2e-tests/test-applications/nextjs-15/package.json

@@ -20,7 +20,7 @@
     "@types/react": "18.0.26",
     "@types/react-dom": "18.0.9",
     "ai": "^3.0.0",
-    "next": "15.5.15",
+    "next": "15.5.18",
     "react": "latest",
     "react-dom": "latest",
     "typescript": "~5.0.0",