[Snyk] Security upgrade express from 4.18.1 to 4.21.2#13

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ksenijam14 wants to merge 1 commit intomasterfrom snyk-fix-9a63afd046ff0317f0096478278ca381

+603-191

Commits on Dec 13, 2024

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