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

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

Change-Id: I5ba7abae49a7c295565c6281bfd56271cd307d0b

wikimedia/mediawiki-extensions-CategoryTagSorter,wikimedia/mediawiki-extensions-CategoryTagSorter