[Snyk] Security upgrade debian from 9.5-slim to stretch-20210329-slim#7

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snyk-fix-09e879e79e3a9e6baa64412424edb4e5

Commits on Apr 10, 2021

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