[Snyk] Security upgrade firebase-admin from 10.3.0 to 12.0.0#16

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FixleCH wants to merge 1 commit intomainfrom

snyk-fix-d04a62bfcc6309465f255b329d87216a

Commits on Apr 17, 2026

fix: src/backend/package.json to reduce vulnerabilities
snyk-bot
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