[Snyk] Security upgrade debian from 9.5-slim to stretch-20220228-slim#158

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-412bd67f966afe4900a57b319f605d33

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Commits on Mar 18, 2022

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