Update dependency marked to v18

Author: renovate[bot]

package.json

@@ -66,7 +66,7 @@
         "jest": "^29.7.0",
         "jest-environment-jsdom": "^30.3.0",
         "jsdom": "^25.0.1",
-        "marked": "^14.1.2",
+        "marked": "^18.0.0",
         "marked-highlight": "^2.1.4",
         "nodemon": "^3.1.7",
         "npm-run-all": "^4.1.5",