[Snyk] Security upgrade ubuntu from 16.04 to xenial-20210416#2

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-f2f3429f39edfdc16bb3b0cd5d96a40a

+1-1

Commits on Jul 18, 2021

fix: Dockerfile to reduce vulnerabilities
snyk-bot
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