[Snyk] Security upgrade express from 4.17.1 to 4.21.1#15

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KeeganC09 wants to merge 1 commit intomainfrom

snyk-fix-980335b0c733d2ab77e94e7249aa4f7b

Commits on Oct 10, 2024

fix: Backend/package.json & Backend/package-lock.json to reduce vulnerabilities
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