[Snyk] Security upgrade debian from 9.5-slim to stretch-20210816-slim#298

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-fe93e52b5b24a64ebb2819cc7440ede3

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Commits on Aug 18, 2021

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