[Snyk] Security upgrade express from 4.17.3 to 4.21.1#12

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Hailfire805 wants to merge 1 commit intomasterfrom snyk-fix-d8143edbde26c6a701a623755f9f98ef

+315-179

Commits on Oct 13, 2024

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