Update nextjs monorepo to v15.5.2 (#224)

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

Author: renovate[bot]

package-lock.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "markdown-to-jsx": "^7.4.7",
-    "next": "15.5.0",
+    "next": "15.5.2",
     "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },