chore(deps): bump next from 15.1.5 to 15.2.3 in /docs (#80)

Bumps [next](https://github.com/vercel/next.js) from 15.1.5 to 15.2.3.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v15.1.5...v15.2.3)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@tabler/icons-react": "^3.29.0",
     "geist": "^1.3.1",
-    "next": "15.1.5",
+    "next": "15.2.3",
     "nextra": "^4.1.0",
     "nextra-theme-docs": "^4.1.0",
     "react": "^19.0.0",