[Snyk] Security upgrade express from 4.17.3 to 4.21.0#10

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Hailfire805 wants to merge 1 commit intomasterfrom snyk-fix-747193f2fe07b9ee0efe0b2986be7cfd

+315-179

Commits on Sep 12, 2024

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