[Snyk] Security upgrade debian from 9.5-slim to stretch-slim#43

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-1bd4c1a435666eb16d1093b72230058f

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Commits on Jun 26, 2021

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