[Snyk] Upgrade bootstrap from 5.1.3 to 5.3.3#5

earthywh wants to merge 1 commit intomasterearthywh/LimeSurvey:masterfrom

snyk-upgrade-51e8da76922fa6ae9e6eac5aaf9003e1earthywh/LimeSurvey:snyk-upgrade-51e8da76922fa6ae9e6eac5aaf9003e1Copy head branch name to clipboard