build: Updating eslint-utils to 1.4.2
build: Updating eslint-utils to 1.4.2

* https://npmjs.com/advisories/1118

Additional changes:
* Added .eslintcache to .gitignore.

Change-Id: I746149a6af9804091d57fc2b2870523644487343

wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage