[Snyk] Security upgrade express from 4.19.2 to 4.21.0#8

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shawnsnyk wants to merge 1 commit intomainfrom snyk-fix-bfd67976ecc86043137f7b58f6c73a56

Commits on Sep 12, 2024

fix: javascript-example/express-app-html-response/package.json & javascript-example/express-app-html-response/package-lock.json to reduce vulnerabilities
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