[Snyk] Security upgrade debian from 9.5-slim to stretch-20210408-slim#198

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-ff543c5ab5a9a5b900fc9ee2ed370905

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Commits on May 20, 2021

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