build: Updating npm dependencies
build: Updating npm dependencies

* mkdirp: 0.5.1 → 0.5.3
  * https://npmjs.com/advisories/1179
* eslint: 6.7.2 → 6.8.0
  * https://npmjs.com/advisories/1179

Change-Id: Ia21044aa4fe2329e4116d91775a6731a95fe8833

wikimedia/mediawiki-extensions-Thanks,wikimedia/mediawiki-extensions-Thanks,wikimedia/mediawiki-extensions-Thanks