[Snyk] Security upgrade express from 4.16.4 to 4.21.0#67

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Omrisnyk wants to merge 1 commit intomasterfrom snyk-fix-a8b142028670d083b00a4c1530664f58

+577-146

Commits on Sep 12, 2024

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