[Snyk] Security upgrade debian from 9.5-slim to stretch-20210329-slim#26

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snyk-fix-8e3af8e08daac9d8e651aa3ce62a3f50

Commits on Apr 11, 2021

fix: translations/pt-BR/content/actions/creating-actions/dockerfile-support-for-github-actions.md to reduce vulnerabilities
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