fix(deps): update marked to v18 (#642)

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

Author: renovate[bot]

package.json

@@ -57,7 +57,7 @@
     "astro": "6.1.1",
     "astro-icon": "1.1.5",
     "date-fns": "4.1.0",
-    "marked": "17.0.5",
+    "marked": "18.0.0",
     "octokit": "5.0.5",
     "sharp": "0.34.5",
     "tailwind-merge": "3.5.0",