[Snyk] Security upgrade debian from 9.5-slim to stretch-20210721-slim#104

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snyk-fix-8b0b29811e83d40db1c7d411a5c5ac45

Commits on Jul 23, 2021

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