chore(deps): bump next from 15.5.18 to 15.5.28

Bumps [next](https://github.com/vercel/next.js) from 15.5.18 to 15.5.28.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Commits](vercel/next.js@v15.5.18...v15.5.28)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.28
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -39,7 +39,7 @@
     "classnames": "^2.2.6",
     "debounce": "^1.2.1",
     "github-slugger": "^1.3.0",
-    "next": "15.5.18",
+    "next": "15.5.28",
     "next-remote-watch": "^1.0.0",
     "parse-numeric-range": "^1.2.0",
     "raw-loader": "^4.0.2",