[Snyk] Security upgrade express from 4.17.1 to 4.21.0#13

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KeeganC09 wants to merge 1 commit intomainfrom

snyk-fix-9a0f899b88047f5e296de42ebcb09844

Commits on Sep 12, 2024

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