[Snyk] Security upgrade debian from 9.5-slim to stretch-20211220-slim#116

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-3f58b12fa9dfd9fcb2e55dab2cdbd0e1

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Commits on Jan 27, 2022

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