[Snyk] Security upgrade debian from 9.5-slim to stretch-slim#2

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snyk-bot wants to merge 1 commit intomainfrom snyk-fix-2bd4364d6bb16bc6f8b46fe59f5da70d

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Commits on Feb 25, 2022

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