[Snyk] Security upgrade express from 4.18.2 to 4.21.2#81

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Brandylee24 wants to merge 1 commit intomasterfrom snyk-fix-f8e4450b861ac72a096a4d455eb96b88

+604-172

Commits on Dec 12, 2024

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