[Security] Bump marked from 0.3.6 to 0.6.0

Bumps [marked](https://github.com/markedjs/marked) from 0.3.6 to 0.6.0. **This update includes security fixes.**
- [Release notes](https://github.com/markedjs/marked/releases)
- [Commits](markedjs/marked@v0.3.6...v0.6.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Author: dependabot-support

core/js/dist/main.js

@@ -37,7 +37,7 @@
     "jquery-migrate": "^1.4.0",
     "jquery-ui-dist": "^1.12.1",
     "jstimezonedetect": "^1.0.6",
-    "marked": "^0.3.6",
+    "marked": "^0.6.0",
     "moment": "^2.18.1",
     "select2": "https://github.com/select2/select2#3.4.8",
     "snap.js": "^2.0.9",