build: Updating browserslist to 4.16.6
build: Updating browserslist to 4.16.6

* https://npmjs.com/advisories/1747 (CVE-2021-23364)

Change-Id: I04d71caf06272f40f1b935080276226a24a04013

wikimedia/mediawiki-extensions-SemanticRating,wikimedia/mediawiki-extensions-SemanticRating