[Snyk] Security upgrade express from 4.19.2 to 4.21.0#6

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shawnsnyk wants to merge 1 commit intomainfrom snyk-fix-b3befa42c5fb86b540c3741c311be1e8

Commits on Sep 12, 2024

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