[Snyk] Security upgrade express from 4.17.1 to 4.21.1#24

joeawillis wants to merge 1 commit intomastersignal-noise/webpack-dev-server:masterfrom

snyk-fix-a589afac803d352ed84daa2f95e64446signal-noise/webpack-dev-server:snyk-fix-a589afac803d352ed84daa2f95e64446Copy head branch name to clipboard