[Snyk] Security upgrade express from 4.18.1 to 4.21.2#4

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Godstimendako wants to merge 1 commit intomainfrom snyk-fix-1a7b674d63e1c5af278dbfd3a64caeac

+226-84

Commits on Dec 12, 2024

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