build(deps): bump marked from 4.0.18 to 4.0.19 (#4789)

Bumps [marked](https://github.com/markedjs/marked) from 4.0.18 to 4.0.19.
- [Release notes](https://github.com/markedjs/marked/releases)
- [Changelog](https://github.com/markedjs/marked/blob/master/.releaserc.json)
- [Commits](markedjs/marked@v4.0.18...v4.0.19)

Author: dependabot[bot]

package-lock.json

@@ -41,7 +41,7 @@
     "jstransformer-handlebars": "^1.2.0",
     "junk": "^3.1.0",
     "lodash.defaultsdeep": "^4.6.1",
-    "marked": "^4.0.18",
+    "marked": "^4.0.19",
     "metalsmith": "^2.5.0",
     "metalsmith-collections": "^0.9.0",
     "metalsmith-feed": "^1.0.0",