fix(deps): update dependency next to v15.5.8 [security]

Author: renovate[bot]

package.json

@@ -33,7 +33,7 @@
     "@octokit/rest": "22.0.0",
     "@vercel/analytics": "1.5.0",
     "geist": "1.5.1",
-    "next": "15.5.7",
+    "next": "15.5.8",
     "react": "19.1.1",
     "react-dom": "19.1.1",
     "sonner": "2.0.7",