[Snyk] Security upgrade ubuntu from 16.04 to xenial-20210416#5

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-186dec6f56f8df7e7e3a4c58fde3a290

+1-1

Commits on Jan 1, 2022

fix: Dockerfile to reduce vulnerabilities
snyk-bot
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