chore(deps): update dependency marked to v9 (#357)

Author: renovate[bot]

docs/package-lock.json

@@ -18,7 +18,7 @@
     "gatsby-transformer-remark": "^5.23.0",
     "html-react-parser": "^4.0.0",
     "lodash": "^4.17.15",
-    "marked": "^8.0.0",
+    "marked": "^9.0.0",
     "prismjs": "^1.16.0",
     "react": "^17.0.2",
     "react-debounce-render": "^8.0.0",