[Snyk] Security upgrade ubuntu from 16.04 to xenial-20210114#2

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-ea2374be6a9e9bf8085d86a557acd9c7

+1-1

Commits on Jul 16, 2021

fix: docker/standalone/cpu-ubuntu/Dockerfile to reduce vulnerabilities
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