[Snyk] Upgrade @primer/css from 21.0.1 to 21.0.2#5

SerchVet wants to merge 1 commit intomainSerchVet/docs:mainfrom

snyk-upgrade-04ff12eff66f911cf26fe395f8145d2eSerchVet/docs:snyk-upgrade-04ff12eff66f911cf26fe395f8145d2eCopy head branch name to clipboard