[Snyk] Security upgrade firebase-admin from 5.12.1 to 6.0.0#12

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-de25b4f3617a07e07baa9cd93c21ffe1

+1,707-1,018

Commits on Sep 2, 2020

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