fix: upgrade express from 4.18.2 to 4.21.2

Snyk has created this PR to upgrade express from 4.18.2 to 4.21.2.

See this package in npm:
express

See this project in Snyk:
https://app.snyk.io/org/benjaminhuo/project/371c1da5-9664-41d3-929e-6fb3867d5b66?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot