[Snyk] Upgrade core-js from 2.5.3 to 2.6.12#9

snyk-bot wants to merge 1 commit intomastermunrodnz/randomcat:masterfrom

snyk-upgrade-87aa881b854f6d2fd8ecf512b33dc799munrodnz/randomcat:snyk-upgrade-87aa881b854f6d2fd8ecf512b33dc799Copy head branch name to clipboard