chore(deps): bump next from 15.5.14 to 15.5.15

Bumps [next](https://github.com/vercel/next.js) from 15.5.14 to 15.5.15.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.14...v15.5.15)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.15
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -86,7 +86,7 @@
     "mdx-bundler": "^10.0.1",
     "mermaid": "^11.11.0",
     "micromark": "^4.0.0",
-    "next": "^15.5.14",
+    "next": "^15.5.15",
     "next-plausible": "^3.12.4",
     "next-themes": "^0.3.0",
     "nextjs-toploader": "^1.6.6",