Update nextjs monorepo to v15.5.6 (#345)

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

Author: renovate[bot]

package.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "@mdx-js/loader": "3.1.1",
     "@mdx-js/react": "3.1.1",
-    "@next/mdx": "15.5.5",
+    "@next/mdx": "15.5.6",
     "@radix-ui/react-avatar": "1.1.10",
     "@radix-ui/react-dropdown-menu": "2.1.16",
     "@radix-ui/react-label": "2.1.7",
@@ -36,7 +36,7 @@
     "class-variance-authority": "0.7.1",
     "clsx": "2.1.1",
     "lucide-react": "0.546.0",
-    "next": "15.5.5",
+    "next": "15.5.6",
     "next-themes": "0.4.6",
     "react": "19.2.0",
     "react-dom": "19.2.0",
@@ -56,7 +56,7 @@
     "@types/react": "19.2.2",
     "@types/react-dom": "19.2.2",
     "eslint": "9.37.0",
-    "eslint-config-next": "15.5.5",
+    "eslint-config-next": "15.5.6",
     "eslint-config-prettier": "10.1.8",
     "eslint-plugin-oxlint": "1.23.0",
     "oxlint": "1.23.0",