[Snyk] Security upgrade express from 4.17.1 to 4.21.1#21

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ronitg258 wants to merge 1 commit intomasterfrom snyk-fix-21c384d41c7a1afeee1239110e57d3a2

+893-145

Commits on Oct 10, 2024

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