[Snyk] Upgrade: react, react-dom#5

mhill-os wants to merge 1 commit intomainOrdnanceSurvey/web-optimisation-training:mainfrom

snyk-upgrade-529ab118eaa40c858ea53ee89169e10bOrdnanceSurvey/web-optimisation-training:snyk-upgrade-529ab118eaa40c858ea53ee89169e10bCopy head branch name to clipboard