[Snyk] Security upgrade flask from 0.12 to 0.12.3#15

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snyk-fix-491fa08fa642383d8c6ab48f5b69c91awebmagicinformatica/Dockerizing-Python-Flask-Redis-Application:snyk-fix-491fa08fa642383d8c6ab48f5b69c91aCopy head branch name to clipboard