[Snyk] Security upgrade express from 4.9.8 to 4.21.0#31

Bhanditz wants to merge 1 commit intomasterBhanditz/socket.io:masterfrom

snyk-fix-4615e812bc61f1ad2869a681ed20c65fBhanditz/socket.io:snyk-fix-4615e812bc61f1ad2869a681ed20c65fCopy head branch name to clipboard