Update dependency next to v15.5.6 (#3434)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

examples/ssr/package-lock.json

@@ -13,7 +13,7 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "next": "15.5.5",
+    "next": "15.5.6",
     "react": "19.0.0",
     "react-dom": "19.0.0",
     "react-spinners": "0.17.0",