Bump js-yaml from 3.13.1 to 3.14.2 in /script/sync-ghes

Bumps [js-yaml](https://github.com/nodeca/js-yaml) from 3.13.1 to 3.14.2.
- [Changelog](https://github.com/nodeca/js-yaml/blob/master/CHANGELOG.md)
- [Commits](nodeca/js-yaml@3.13.1...3.14.2)

---
updated-dependencies:
- dependency-name: js-yaml
  dependency-version: 3.14.2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

script/sync-ghes/package-lock.json

@@ -14,6 +14,6 @@
     "typescript": "^3.9.2"
   },
   "dependencies": {
-    "js-yaml": "^3.13.1"
+    "js-yaml": "^3.14.2"
   }
 }