[Snyk] Security upgrade express from 4.18.2 to 4.21.1#19

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Gehansat wants to merge 1 commit intotestfrom snyk-fix-983b0ae8f9089e75c9ee4bd4093e58ee

+400-165

Commits on Oct 14, 2024

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