[Snyk] Security upgrade python from 3.7.4-alpine3.10 to 3-alpine3.10#13

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-9ecd5fd9af383702d4681dc385f1d3b4

+1-1

Commits on May 6, 2021

fix: Dockerfile to reduce vulnerabilities
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