[Snyk] Security upgrade debian from 9.5-slim to stretch-20211201-slim#83

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snyk-fix-c51f5cef9f19766db8a7ebacd1b6b9d7

Commits on Jan 29, 2022

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