fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-MARKED-584281

Author: snyk-bot

package-lock.json

@@ -44,7 +44,7 @@
     "jstransformer-handlebars": "^1.1.0",
     "junk": "^3.1.0",
     "lodash.defaultsdeep": "^4.6.1",
-    "marked": "^0.8.2",
+    "marked": "^1.1.1",
     "metalsmith": "^2.3.0",
     "metalsmith-collections": "^0.9.0",
     "metalsmith-discover-helpers": "^0.1.1",