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

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

Change-Id: Icc4751ce9d462cc681e3c3767be9c3e95e4ec2d4

wikimedia/mediawiki-extensions-GoogleLogin,wikimedia/mediawiki-extensions-GoogleLogin