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

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

Change-Id: I80fd551e3ea6b40bb58b434ae38ffc4fea7b7d1c

wikimedia/mediawiki-extensions-Arrays,wikimedia/mediawiki-extensions-Arrays