[Snyk] Security upgrade express from 4.16.4 to 4.21.0#46

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bjkeller wants to merge 1 commit intomasterfrom snyk-fix-e7a823ad0290ae5805386e18bf35ad01

+469-132

Commits on Sep 12, 2024

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