[Snyk] Security upgrade debian from 9.5-slim to 9-slim#199

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-3aa2ffb4b0102968889315ce85ffdbce

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Commits on May 15, 2022

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