[Snyk] Security upgrade python from 3.7.3-alpine to 3.12.0a6-alpine#121

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avurlerby wants to merge 1 commit intomasterfrom

snyk-fix-299bc16c7b898a158f7f48cf46c6bd43

Commits on Mar 15, 2023

fix: src/chap11-Docker/flask-hello-world/Dockerfile to reduce vulnerabilities
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