[Snyk] Security upgrade express from 4.19.2 to 4.21.2#4

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snyk-io[bot] wants to merge 1 commit intomainfrom

snyk-fix-35da1884fc3b57a482945f59aa58f847

Commits on Dec 6, 2024

fix: backend/package.json & backend/package-lock.json to reduce vulnerabilities
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