[Snyk] Security upgrade ubuntu from 20.04 to groovy-20210416#8

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-1a62e89158c0e5b87efef9653f517dbb

+1-1

Commits on May 21, 2021

fix: docker/onadata-uwsgi/Dockerfile to reduce vulnerabilities
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