[Snyk] Security upgrade debian from 9.5-slim to stretch-20211201-slim#103

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-acd3158d5dcc8c3871ebc8342e5f5135

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Commits on Jan 19, 2022

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