fix(deps): update dependency marked to v18

Author: renovate[bot]

package-lock.json

@@ -13,7 +13,7 @@
     "astro": "5.18.1",
     "bootstrap-italia": "2.18.1",
     "decap-cms-app": "3.12.2",
-    "marked": "16.4.2",
+    "marked": "18.0.3",
     "prettier-plugin-astro": "0.14.1"
   },
   "devDependencies": {