chore(deps): bump next from 15.5.15 to 15.5.18 in /cypress/apps/next-app

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]

cypress/apps/next-app/package-lock.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "@govtechsg/sgds-web-component": "3.16.0",
     "@webcomponents/scoped-custom-element-registry": "^0.0.10",
-    "next": ">=15.5.15",
+    "next": ">=15.5.18",
     "react": "19.2.3",
     "react-dom": "19.2.3"
   },