[Snyk] Security upgrade python from 3.7.4-alpine3.10 to 3.8.3-alpine3.10#17

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-b81b4755c09ffbaf311302156a3c1e56

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Commits on Jun 14, 2021

fix: Dockerfile to reduce vulnerabilities
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