[Snyk] Security upgrade python from 3.7.7-alpine3.11 to 3.8.6-alpine3.11#9

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-594f29be7b19f4b866fc4c2dd32a7539

+1-1

Commits on Mar 31, 2021

fix: backend/Dockerfile.dev to reduce vulnerabilities
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