[Snyk] Security upgrade express from 4.19.2 to 4.21.0#9

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dawit2123 wants to merge 1 commit intomainfrom snyk-fix-d582237e59f8712025fcbd8375f185ab

Commits on Sep 12, 2024

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