[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-21307528a8a171e863a0074404e0f1e8

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Commits on Jan 29, 2022

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