[Snyk] Security upgrade firebase-admin from 5.8.2 to 9.2.0#100

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-b0b39d3742eca280a055e9a96bf7ab69

+1,255-2,270

Commits on Sep 15, 2020

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